diff --git a/Lib/UserString.py b/Lib/UserString.py
index d8eec15..2d02b9b 100755
--- a/Lib/UserString.py
+++ b/Lib/UserString.py
@@ -2,7 +2,7 @@
 ## vim:ts=4:et:nowrap
 """A user-defined wrapper around string objects
 
-Note: string objects have grown methods in Python 1.6 
+Note: string objects have grown methods in Python 1.6
 This module requires Python 1.6 or later.
 """
 from types import StringType, UnicodeType
@@ -14,7 +14,7 @@
             self.data = seq
         elif isinstance(seq, UserString):
             self.data = seq.data[:]
-        else: 
+        else:
             self.data = str(seq)
     def __str__(self): return str(self.data)
     def __repr__(self): return repr(self.data)
@@ -76,15 +76,15 @@
                 return self.__class__(self.data.encode(encoding, errors))
             else:
                 return self.__class__(self.data.encode(encoding))
-        else: 
+        else:
             return self.__class__(self.data.encode())
     def endswith(self, suffix, start=0, end=sys.maxint):
         return self.data.endswith(suffix, start, end)
-    def expandtabs(self, tabsize=8): 
+    def expandtabs(self, tabsize=8):
         return self.__class__(self.data.expandtabs(tabsize))
-    def find(self, sub, start=0, end=sys.maxint): 
+    def find(self, sub, start=0, end=sys.maxint):
         return self.data.find(sub, start, end)
-    def index(self, sub, start=0, end=sys.maxint): 
+    def index(self, sub, start=0, end=sys.maxint):
         return self.data.index(sub, start, end)
     def isalpha(self): return self.data.isalpha()
     def isalnum(self): return self.data.isalnum()
@@ -99,23 +99,23 @@
     def ljust(self, width): return self.__class__(self.data.ljust(width))
     def lower(self): return self.__class__(self.data.lower())
     def lstrip(self): return self.__class__(self.data.lstrip())
-    def replace(self, old, new, maxsplit=-1): 
+    def replace(self, old, new, maxsplit=-1):
         return self.__class__(self.data.replace(old, new, maxsplit))
-    def rfind(self, sub, start=0, end=sys.maxint): 
+    def rfind(self, sub, start=0, end=sys.maxint):
         return self.data.rfind(sub, start, end)
-    def rindex(self, sub, start=0, end=sys.maxint): 
+    def rindex(self, sub, start=0, end=sys.maxint):
         return self.data.rindex(sub, start, end)
     def rjust(self, width): return self.__class__(self.data.rjust(width))
     def rstrip(self): return self.__class__(self.data.rstrip())
-    def split(self, sep=None, maxsplit=-1): 
+    def split(self, sep=None, maxsplit=-1):
         return self.data.split(sep, maxsplit)
     def splitlines(self, keepends=0): return self.data.splitlines(keepends)
-    def startswith(self, prefix, start=0, end=sys.maxint): 
+    def startswith(self, prefix, start=0, end=sys.maxint):
         return self.data.startswith(prefix, start, end)
     def strip(self): return self.__class__(self.data.strip())
     def swapcase(self): return self.__class__(self.data.swapcase())
     def title(self): return self.__class__(self.data.title())
-    def translate(self, *args): 
+    def translate(self, *args):
         return self.__class__(self.data.translate(*args))
     def upper(self): return self.__class__(self.data.upper())
 
@@ -136,7 +136,7 @@
     A faster and better solution is to rewrite your program using lists."""
     def __init__(self, string=""):
         self.data = string
-    def __hash__(self): 
+    def __hash__(self):
         raise TypeError, "unhashable type (it is mutable)"
     def __setitem__(self, index, sub):
         if index < 0 or index >= len(self.data): raise IndexError
@@ -157,7 +157,7 @@
         self.data = self.data[:start] + self.data[end:]
     def immutable(self):
         return UserString(self.data)
-    
+
 if __name__ == "__main__":
     # execute the regression test to stdout, if called as a script:
     import os
diff --git a/Lib/urllib.py b/Lib/urllib.py
index d0031f6..e79acf0 100644
--- a/Lib/urllib.py
+++ b/Lib/urllib.py
@@ -551,11 +551,11 @@
             if match:
                 scheme, realm = match.groups()
                 if scheme.lower() == 'basic':
-                   name = 'retry_' + self.type + '_basic_auth'
-                   if data is None:
-                       return getattr(self,name)(url, realm)
-                   else:
-                       return getattr(self,name)(url, realm, data)
+                    name = 'retry_' + self.type + '_basic_auth'
+                    if data is None:
+                        return getattr(self,name)(url, realm)
+                    else:
+                        return getattr(self,name)(url, realm, data)
 
     def retry_http_basic_auth(self, url, realm, data=None):
         host, selector = splithost(url)
@@ -571,14 +571,14 @@
             return self.open(newurl, data)
 
     def retry_https_basic_auth(self, url, realm, data=None):
-            host, selector = splithost(url)
-            i = host.find('@') + 1
-            host = host[i:]
-            user, passwd = self.get_user_passwd(host, realm, i)
-            if not (user or passwd): return None
-            host = user + ':' + passwd + '@' + host
-            newurl = '//' + host + selector
-            return self.open_https(newurl)
+        host, selector = splithost(url)
+        i = host.find('@') + 1
+        host = host[i:]
+        user, passwd = self.get_user_passwd(host, realm, i)
+        if not (user or passwd): return None
+        host = user + ':' + passwd + '@' + host
+        newurl = '//' + host + selector
+        return self.open_https(newurl)
 
     def get_user_passwd(self, host, realm, clear_cache = 0):
         key = realm + '@' + host.lower()
diff --git a/Lib/urllib2.py b/Lib/urllib2.py
index 3e1e588..cf94d2f 100644
--- a/Lib/urllib2.py
+++ b/Lib/urllib2.py
@@ -1,12 +1,12 @@
 """An extensible library for opening URLs using a variety of protocols
 
 The simplest way to use this module is to call the urlopen function,
-which accepts a string containing a URL or a Request object (described 
+which accepts a string containing a URL or a Request object (described
 below).  It opens the URL and returns the results as file-like
 object; the returned object has some extra methods described below.
 
 The OpenerDirectory manages a collection of Handler objects that do
-all the actual work.  Each Handler implements a particular protocol or 
+all the actual work.  Each Handler implements a particular protocol or
 option.  The OpenerDirector is a composite object that invokes the
 Handlers needed to open the requested URL.  For example, the
 HTTPHandler performs HTTP GET and POST requests and deals with
@@ -16,7 +16,7 @@
 
 urlopen(url, data=None) -- basic usage is that same as original
 urllib.  pass the url and optionally data to post to an HTTP URL, and
-get a file-like object back.  One difference is that you can also pass 
+get a file-like object back.  One difference is that you can also pass
 a Request instance instead of URL.  Raises a URLError (subclass of
 IOError); for HTTP errors, raises an HTTPError, which can also be
 treated as a valid response.
@@ -42,7 +42,7 @@
 URLError-- a subclass of IOError, individual protocols have their own
 specific subclass
 
-HTTPError-- also a valid HTTP response, so you can treat an HTTP error 
+HTTPError-- also a valid HTTP response, so you can treat an HTTP error
 as an exceptional event or valid response
 
 internals:
@@ -57,7 +57,7 @@
 authinfo = urllib2.HTTPBasicAuthHandler()
 authinfo.add_password('realm', 'host', 'username', 'password')
 
-# build a new opener that adds authentication and caching FTP handlers 
+# build a new opener that adds authentication and caching FTP handlers
 opener = urllib2.build_opener(authinfo, urllib2.CacheFTPHandler)
 
 # install it
@@ -73,7 +73,7 @@
  # authentication for some reason but fails, how should the error be
  # signalled?  The client needs to know the HTTP error code.  But if
  # the handler knows that the problem was, e.g., that it didn't know
- # that hash algo that requested in the challenge, it would be good to 
+ # that hash algo that requested in the challenge, it would be good to
  # pass that information along to the client, too.
 
 # XXX to do:
@@ -141,7 +141,7 @@
     _opener = opener
 
 # do these error classes make sense?
-# make sure all of the IOError stuff is overridden.  we just want to be 
+# make sure all of the IOError stuff is overridden.  we just want to be
  # subtypes.
 
 class URLError(IOError):
@@ -165,7 +165,7 @@
         self.fp = fp
         # XXX
         self.filename = url
-        
+
     def __str__(self):
         return 'HTTP Error %s: %s' % (self.code, self.msg)
 
@@ -192,7 +192,7 @@
 
     def __getattr__(self, attr):
         # XXX this is a fallback mechanism to guard against these
-        # methods getting called in a non-standard order.  this may be 
+        # methods getting called in a non-standard order.  this may be
         # too complicated and/or unnecessary.
         # XXX should the __r_XXX attributes be public?
         if attr[:12] == '_Request__r_':
@@ -259,7 +259,7 @@
         for meth in get_methods(handler):
             if meth[-5:] == '_open':
                 protocol = meth[:-5]
-                if self.handle_open.has_key(protocol): 
+                if self.handle_open.has_key(protocol):
                     self.handle_open[protocol].append(handler)
                 else:
                     self.handle_open[protocol] = [handler]
@@ -285,7 +285,7 @@
         if added:
             self.handlers.append(handler)
             handler.add_parent(self)
-        
+
     def __del__(self):
         self.close()
 
@@ -314,9 +314,9 @@
             if data is not None:
                 req.add_data(data)
         assert isinstance(req, Request) # really only care about interface
-        
+
         result = self._call_chain(self.handle_open, 'default',
-                                  'default_open', req)  
+                                  'default_open', req)
         if result:
             return result
 
@@ -381,7 +381,7 @@
 # XXX probably also want an abstract factory that knows things like
  # the fact that a ProxyHandler needs to get inserted first.
 # would also know when it makes sense to skip a superclass in favor of
- # a subclass and when it might make sense to include both 
+ # a subclass and when it might make sense to include both
 
 def build_opener(*handlers):
     """Create an opener object from a list of handlers.
@@ -393,7 +393,7 @@
     If any of the handlers passed as arguments are subclasses of the
     default handlers, the default handlers will not be used.
     """
-    
+
     opener = OpenerDirector()
     default_classes = [ProxyHandler, UnknownHandler, HTTPHandler,
                        HTTPDefaultErrorHandler, HTTPRedirectHandler,
@@ -472,7 +472,7 @@
         assert hasattr(proxies, 'has_key'), "proxies must be a mapping"
         self.proxies = proxies
         for type, url in proxies.items():
-            setattr(self, '%s_open' % type, 
+            setattr(self, '%s_open' % type,
                     lambda r, proxy=url, type=type, meth=self.proxy_open: \
                     meth(r, proxy, type))
 
@@ -574,7 +574,7 @@
         if len(common) == len(base[1]):
             return 1
         return 0
-        
+
 
 class HTTPBasicAuthHandler(BaseHandler):
     rx = re.compile('[ \t]*([^ \t]+)[ \t]+realm="([^"]*)"')
@@ -590,8 +590,8 @@
         # if __current_realm is not None, then the server must have
         # refused our name/password and is asking for authorization
         # again.  must be careful to set it to None on successful
-        # return. 
-    
+        # return.
+
     def http_error_401(self, req, fp, code, msg, headers):
         # XXX could be mult. headers
         authreq = headers.get('www-authenticate', None)
@@ -674,7 +674,7 @@
             return None
 
         user, pw = self.passwd.find_user_password(realm,
-                                                  req.get_full_url()) 
+                                                  req.get_full_url())
         if user is None:
             return None
 
@@ -724,8 +724,8 @@
         n = ord(c) & 0xf
         hexrep.append(hex(n)[-1])
     return string.join(hexrep, '')
-        
-        
+
+
 class HTTPHandler(BaseHandler):
     def http_open(self, req):
         # XXX devise a new mechanism to specify user/password
@@ -745,7 +745,7 @@
                 h.putrequest('GET', req.get_selector())
         except socket.error, err:
             raise URLError(err)
-            
+
         # XXX proxies would have different host here
         h.putheader('Host', host)
         for args in self.parent.addheaders:
@@ -813,7 +813,7 @@
                 start = i
                 inquote = 0
             else:
-                i = i + q 
+                i = i + q
         else:
             if c < q:
                 list.append(s[start:i+c])
@@ -838,7 +838,7 @@
     names = None
     def get_names(self):
         if FileHandler.names is None:
-            FileHandler.names = (socket.gethostbyname('localhost'), 
+            FileHandler.names = (socket.gethostbyname('localhost'),
                                  socket.gethostbyname(socket.gethostname()))
         return FileHandler.names
 
@@ -967,7 +967,7 @@
 class OpenerFactory:
 
     default_handlers = [UnknownHandler, HTTPHandler,
-                        HTTPDefaultErrorHandler, HTTPRedirectHandler, 
+                        HTTPDefaultErrorHandler, HTTPRedirectHandler,
                         FTPHandler, FileHandler]
     proxy_handlers = [ProxyHandler]
     handlers = []
@@ -990,7 +990,7 @@
             opener.add_handler(ph)
 
 if __name__ == "__main__":
-    # XXX some of the test code depends on machine configurations that 
+    # XXX some of the test code depends on machine configurations that
     # are internal to CNRI.   Need to set up a public server with the
     # right authentication configuration for test purposes.
     if socket.gethostname() == 'bitdiddle':
@@ -1030,11 +1030,11 @@
 
         bauth = HTTPBasicAuthHandler()
         bauth.add_password('basic_test_realm', localhost, 'jhylton',
-                           'password') 
-        dauth = HTTPDigestAuthHandler()
-        dauth.add_password('digest_test_realm', localhost, 'jhylton', 
                            'password')
-        
+        dauth = HTTPDigestAuthHandler()
+        dauth.add_password('digest_test_realm', localhost, 'jhylton',
+                           'password')
+
 
     cfh = CacheFTPHandler()
     cfh.setTimeout(1)
diff --git a/Lib/urlparse.py b/Lib/urlparse.py
index b747bc6..b9ecee1 100644
--- a/Lib/urlparse.py
+++ b/Lib/urlparse.py
@@ -6,25 +6,25 @@
 
 # A classification of schemes ('' means apply by default)
 uses_relative = ['ftp', 'http', 'gopher', 'nntp', 'wais', 'file',
-		 'https', 'shttp',
-		 'prospero', 'rtsp', 'rtspu', '']
+                 'https', 'shttp',
+                 'prospero', 'rtsp', 'rtspu', '']
 uses_netloc = ['ftp', 'http', 'gopher', 'nntp', 'telnet', 'wais',
-	       'file',
-	       'https', 'shttp', 'snews',
-	       'prospero', 'rtsp', 'rtspu', '']
+               'file',
+               'https', 'shttp', 'snews',
+               'prospero', 'rtsp', 'rtspu', '']
 non_hierarchical = ['gopher', 'hdl', 'mailto', 'news', 'telnet', 'wais',
-		    'snews', 'sip',
-		    ]
+                    'snews', 'sip',
+                    ]
 uses_params = ['ftp', 'hdl', 'prospero', 'http',
-	       'https', 'shttp', 'rtsp', 'rtspu', 'sip',
-	       '']
+               'https', 'shttp', 'rtsp', 'rtspu', 'sip',
+               '']
 uses_query = ['http', 'wais',
-	      'https', 'shttp',
-	      'gopher', 'rtsp', 'rtspu', 'sip',
-	      '']
+              'https', 'shttp',
+              'gopher', 'rtsp', 'rtspu', 'sip',
+              '']
 uses_fragment = ['ftp', 'hdl', 'http', 'gopher', 'news', 'nntp', 'wais',
-		 'https', 'shttp', 'snews',
-		 'file', 'prospero', '']
+                 'https', 'shttp', 'snews',
+                 'file', 'prospero', '']
 
 # Characters valid in scheme names
 scheme_chars = ('abcdefghijklmnopqrstuvwxyz'
@@ -36,158 +36,158 @@
 _parse_cache = {}
 
 def clear_cache():
-	"""Clear the parse cache."""
-	global _parse_cache
-	_parse_cache = {}
+    """Clear the parse cache."""
+    global _parse_cache
+    _parse_cache = {}
 
 
 def urlparse(url, scheme = '', allow_fragments = 1):
-	"""Parse a URL into 6 components:
-	<scheme>://<netloc>/<path>;<params>?<query>#<fragment>
-	Return a 6-tuple: (scheme, netloc, path, params, query, fragment).
-	Note that we don't break the components up in smaller bits
-	(e.g. netloc is a single string) and we don't expand % escapes."""
-	key = url, scheme, allow_fragments
-	cached = _parse_cache.get(key, None)
-	if cached:
-		return cached
-	if len(_parse_cache) >= MAX_CACHE_SIZE:	# avoid runaway growth
-		clear_cache()
-	netloc = path = params = query = fragment = ''
-	i = url.find(':')
-	if i > 0:
-		if url[:i] == 'http': # optimize the common case
-			scheme = url[:i].lower()
-			url = url[i+1:]
-			if url[:2] == '//':
-				i = url.find('/', 2)
-				if i < 0:
-					i = len(url)
-				netloc = url[2:i]
-				url = url[i:]
-			if allow_fragments:
-				i = url.rfind('#')
-				if i >= 0:
-					fragment = url[i+1:]
-					url = url[:i]
-			i = url.find('?')
-			if i >= 0:
-				query = url[i+1:]
-				url = url[:i]
-			i = url.find(';')
-			if i >= 0:
-				params = url[i+1:]
-				url = url[:i]
-			tuple = scheme, netloc, url, params, query, fragment
-			_parse_cache[key] = tuple
-			return tuple
-		for c in url[:i]:
-			if c not in scheme_chars:
-				break
-		else:
-			scheme, url = url[:i].lower(), url[i+1:]
-	if scheme in uses_netloc:
-		if url[:2] == '//':
-			i = url.find('/', 2)
-			if i < 0:
-				i = len(url)
-			netloc, url = url[2:i], url[i:]
-	if allow_fragments and scheme in uses_fragment:
-		i = url.rfind('#')
-		if i >= 0:
-			url, fragment = url[:i], url[i+1:]
-	if scheme in uses_query:
-		i = url.find('?')
-		if i >= 0:
-			url, query = url[:i], url[i+1:]
-	if scheme in uses_params:
-		i = url.find(';')
-		if i >= 0:
-			url, params = url[:i], url[i+1:]
-	tuple = scheme, netloc, url, params, query, fragment
-	_parse_cache[key] = tuple
-	return tuple
+    """Parse a URL into 6 components:
+    <scheme>://<netloc>/<path>;<params>?<query>#<fragment>
+    Return a 6-tuple: (scheme, netloc, path, params, query, fragment).
+    Note that we don't break the components up in smaller bits
+    (e.g. netloc is a single string) and we don't expand % escapes."""
+    key = url, scheme, allow_fragments
+    cached = _parse_cache.get(key, None)
+    if cached:
+        return cached
+    if len(_parse_cache) >= MAX_CACHE_SIZE: # avoid runaway growth
+        clear_cache()
+    netloc = path = params = query = fragment = ''
+    i = url.find(':')
+    if i > 0:
+        if url[:i] == 'http': # optimize the common case
+            scheme = url[:i].lower()
+            url = url[i+1:]
+            if url[:2] == '//':
+                i = url.find('/', 2)
+                if i < 0:
+                    i = len(url)
+                netloc = url[2:i]
+                url = url[i:]
+            if allow_fragments:
+                i = url.rfind('#')
+                if i >= 0:
+                    fragment = url[i+1:]
+                    url = url[:i]
+            i = url.find('?')
+            if i >= 0:
+                query = url[i+1:]
+                url = url[:i]
+            i = url.find(';')
+            if i >= 0:
+                params = url[i+1:]
+                url = url[:i]
+            tuple = scheme, netloc, url, params, query, fragment
+            _parse_cache[key] = tuple
+            return tuple
+        for c in url[:i]:
+            if c not in scheme_chars:
+                break
+        else:
+            scheme, url = url[:i].lower(), url[i+1:]
+    if scheme in uses_netloc:
+        if url[:2] == '//':
+            i = url.find('/', 2)
+            if i < 0:
+                i = len(url)
+            netloc, url = url[2:i], url[i:]
+    if allow_fragments and scheme in uses_fragment:
+        i = url.rfind('#')
+        if i >= 0:
+            url, fragment = url[:i], url[i+1:]
+    if scheme in uses_query:
+        i = url.find('?')
+        if i >= 0:
+            url, query = url[:i], url[i+1:]
+    if scheme in uses_params:
+        i = url.find(';')
+        if i >= 0:
+            url, params = url[:i], url[i+1:]
+    tuple = scheme, netloc, url, params, query, fragment
+    _parse_cache[key] = tuple
+    return tuple
 
 def urlunparse((scheme, netloc, url, params, query, fragment)):
-	"""Put a parsed URL back together again.  This may result in a
-	slightly different, but equivalent URL, if the URL that was parsed
-	originally had redundant delimiters, e.g. a ? with an empty query
-	(the draft states that these are equivalent)."""
-	if netloc or (scheme in uses_netloc and url[:2] == '//'):
-		if url and url[:1] != '/': url = '/' + url
-		url = '//' + (netloc or '') + url
-	if scheme:
-		url = scheme + ':' + url
-	if params:
-		url = url + ';' + params
-	if query:
-		url = url + '?' + query
-	if fragment:
-		url = url + '#' + fragment
-	return url
+    """Put a parsed URL back together again.  This may result in a
+    slightly different, but equivalent URL, if the URL that was parsed
+    originally had redundant delimiters, e.g. a ? with an empty query
+    (the draft states that these are equivalent)."""
+    if netloc or (scheme in uses_netloc and url[:2] == '//'):
+        if url and url[:1] != '/': url = '/' + url
+        url = '//' + (netloc or '') + url
+    if scheme:
+        url = scheme + ':' + url
+    if params:
+        url = url + ';' + params
+    if query:
+        url = url + '?' + query
+    if fragment:
+        url = url + '#' + fragment
+    return url
 
 def urljoin(base, url, allow_fragments = 1):
-	"""Join a base URL and a possibly relative URL to form an absolute
-	interpretation of the latter."""
-	if not base:
-		return url
-	if not url:
-		return base
-	bscheme, bnetloc, bpath, bparams, bquery, bfragment = \
-		urlparse(base, '', allow_fragments)
-	scheme, netloc, path, params, query, fragment = \
-		urlparse(url, bscheme, allow_fragments)
-	if scheme != bscheme or scheme not in uses_relative:
-		return url
-	if scheme in uses_netloc:
-		if netloc:
-			return urlunparse((scheme, netloc, path,
-					   params, query, fragment))
-		netloc = bnetloc
-	if path[:1] == '/':
-		return urlunparse((scheme, netloc, path,
-				   params, query, fragment))
-	if not path:
-		if not params:
-			params = bparams
-			if not query:
-				query = bquery
-		return urlunparse((scheme, netloc, bpath,
-				   params, query, fragment))
-	segments = bpath.split('/')[:-1] + path.split('/')
-	# XXX The stuff below is bogus in various ways...
-	if segments[-1] == '.':
-		segments[-1] = ''
-	while '.' in segments:
-		segments.remove('.')
-	while 1:
-		i = 1
-		n = len(segments) - 1
-		while i < n:
-			if (segments[i] == '..'
-			    and segments[i-1] not in ('', '..')):
-				del segments[i-1:i+1]
-				break
-			i = i+1
-		else:
-			break
-	if segments == ['', '..']:
-		segments[-1] = ''
-	elif len(segments) >= 2 and segments[-1] == '..':
-		segments[-2:] = ['']
-	return urlunparse((scheme, netloc, '/'.join(segments),
-			   params, query, fragment))
+    """Join a base URL and a possibly relative URL to form an absolute
+    interpretation of the latter."""
+    if not base:
+        return url
+    if not url:
+        return base
+    bscheme, bnetloc, bpath, bparams, bquery, bfragment = \
+            urlparse(base, '', allow_fragments)
+    scheme, netloc, path, params, query, fragment = \
+            urlparse(url, bscheme, allow_fragments)
+    if scheme != bscheme or scheme not in uses_relative:
+        return url
+    if scheme in uses_netloc:
+        if netloc:
+            return urlunparse((scheme, netloc, path,
+                               params, query, fragment))
+        netloc = bnetloc
+    if path[:1] == '/':
+        return urlunparse((scheme, netloc, path,
+                           params, query, fragment))
+    if not path:
+        if not params:
+            params = bparams
+            if not query:
+                query = bquery
+        return urlunparse((scheme, netloc, bpath,
+                           params, query, fragment))
+    segments = bpath.split('/')[:-1] + path.split('/')
+    # XXX The stuff below is bogus in various ways...
+    if segments[-1] == '.':
+        segments[-1] = ''
+    while '.' in segments:
+        segments.remove('.')
+    while 1:
+        i = 1
+        n = len(segments) - 1
+        while i < n:
+            if (segments[i] == '..'
+                and segments[i-1] not in ('', '..')):
+                del segments[i-1:i+1]
+                break
+            i = i+1
+        else:
+            break
+    if segments == ['', '..']:
+        segments[-1] = ''
+    elif len(segments) >= 2 and segments[-1] == '..':
+        segments[-2:] = ['']
+    return urlunparse((scheme, netloc, '/'.join(segments),
+                       params, query, fragment))
 
 def urldefrag(url):
-	"""Removes any existing fragment from URL.
+    """Removes any existing fragment from URL.
 
-	Returns a tuple of the defragmented URL and the fragment.  If
-	the URL contained no fragments, the second element is the
-	empty string.
-	"""
-	s, n, p, a, q, frag = urlparse(url)
-	defrag = urlunparse((s, n, p, a, q, ''))
-	return defrag, frag
+    Returns a tuple of the defragmented URL and the fragment.  If
+    the URL contained no fragments, the second element is the
+    empty string.
+    """
+    s, n, p, a, q, frag = urlparse(url)
+    defrag = urlunparse((s, n, p, a, q, ''))
+    return defrag, frag
 
 
 test_input = """
@@ -226,34 +226,34 @@
 # XXX The result for //g is actually http://g/; is this a problem?
 
 def test():
-	import sys
-	base = ''
-	if sys.argv[1:]:
-		fn = sys.argv[1]
-		if fn == '-':
-			fp = sys.stdin
-		else:
-			fp = open(fn)
-	else:
-		import StringIO
-		fp = StringIO.StringIO(test_input)
-	while 1:
-		line = fp.readline()
-		if not line: break
-		words = line.split()
-		if not words:
-			continue
-		url = words[0]
-		parts = urlparse(url)
-		print '%-10s : %s' % (url, parts)
-		abs = urljoin(base, url)
-		if not base:
-			base = abs
-		wrapped = '<URL:%s>' % abs
-		print '%-10s = %s' % (url, wrapped)
-		if len(words) == 3 and words[1] == '=':
-			if wrapped != words[2]:
-				print 'EXPECTED', words[2], '!!!!!!!!!!'
+    import sys
+    base = ''
+    if sys.argv[1:]:
+        fn = sys.argv[1]
+        if fn == '-':
+            fp = sys.stdin
+        else:
+            fp = open(fn)
+    else:
+        import StringIO
+        fp = StringIO.StringIO(test_input)
+    while 1:
+        line = fp.readline()
+        if not line: break
+        words = line.split()
+        if not words:
+            continue
+        url = words[0]
+        parts = urlparse(url)
+        print '%-10s : %s' % (url, parts)
+        abs = urljoin(base, url)
+        if not base:
+            base = abs
+        wrapped = '<URL:%s>' % abs
+        print '%-10s = %s' % (url, wrapped)
+        if len(words) == 3 and words[1] == '=':
+            if wrapped != words[2]:
+                print 'EXPECTED', words[2], '!!!!!!!!!!'
 
 if __name__ == '__main__':
-	test()
+    test()
diff --git a/Lib/uu.py b/Lib/uu.py
index bf1f82a..37bdf6a 100755
--- a/Lib/uu.py
+++ b/Lib/uu.py
@@ -3,12 +3,12 @@
 # Copyright 1994 by Lance Ellinghouse
 # Cathedral City, California Republic, United States of America.
 #                        All Rights Reserved
-# Permission to use, copy, modify, and distribute this software and its 
-# documentation for any purpose and without fee is hereby granted, 
+# Permission to use, copy, modify, and distribute this software and its
+# documentation for any purpose and without fee is hereby granted,
 # provided that the above copyright notice appear in all copies and that
-# both that copyright notice and this permission notice appear in 
+# both that copyright notice and this permission notice appear in
 # supporting documentation, and that the name of Lance Ellinghouse
-# not be used in advertising or publicity pertaining to distribution 
+# not be used in advertising or publicity pertaining to distribution
 # of the software without specific, written prior permission.
 # LANCE ELLINGHOUSE DISCLAIMS ALL WARRANTIES WITH REGARD TO
 # THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
@@ -154,7 +154,7 @@
         print ' -d: Decode (in stead of encode)'
         print ' -t: data is text, encoded format unix-compatible text'
         sys.exit(1)
-        
+
     for o, a in optlist:
         if o == '-d': dopt = 1
         if o == '-t': topt = 1
diff --git a/Lib/warnings.py b/Lib/warnings.py
index 31d4ad1..9763dc6 100644
--- a/Lib/warnings.py
+++ b/Lib/warnings.py
@@ -131,29 +131,29 @@
 
 # Helper for _processoptions()
 def _setoption(arg):
-        parts = arg.split(':')
-        if len(parts) > 5:
-            raise _OptionError("too many fields (max 5): %s" % `arg`)
-        while len(parts) < 5:
-            parts.append('')
-        action, message, category, module, lineno = [s.strip()
-                                                     for s in parts]
-        action = _getaction(action)
-        message = re.escape(message)
-        category = _getcategory(category)
-        module = re.escape(module)
-        if module:
-            module = module + '$'
-        if lineno:
-            try:
-                lineno = int(lineno)
-                if lineno < 0:
-                    raise ValueError
-            except (ValueError, OverflowError):
-                raise _OptionError("invalid lineno %s" % `lineno`)
-        else:
-            lineno = 0
-        filterwarnings(action, message, category, module, lineno)
+    parts = arg.split(':')
+    if len(parts) > 5:
+        raise _OptionError("too many fields (max 5): %s" % `arg`)
+    while len(parts) < 5:
+        parts.append('')
+    action, message, category, module, lineno = [s.strip()
+                                                 for s in parts]
+    action = _getaction(action)
+    message = re.escape(message)
+    category = _getcategory(category)
+    module = re.escape(module)
+    if module:
+        module = module + '$'
+    if lineno:
+        try:
+            lineno = int(lineno)
+            if lineno < 0:
+                raise ValueError
+        except (ValueError, OverflowError):
+            raise _OptionError("invalid lineno %s" % `lineno`)
+    else:
+        lineno = 0
+    filterwarnings(action, message, category, module, lineno)
 
 # Helper for _setoption()
 def _getaction(action):
diff --git a/Lib/wave.py b/Lib/wave.py
index e9a1629..ad4f29a 100644
--- a/Lib/wave.py
+++ b/Lib/wave.py
@@ -395,7 +395,7 @@
 
     def getmarkers(self):
         return None
-                
+
     def tell(self):
         return self._nframeswritten
 
diff --git a/Lib/webbrowser.py b/Lib/webbrowser.py
index 759f470..2fa1148 100644
--- a/Lib/webbrowser.py
+++ b/Lib/webbrowser.py
@@ -122,7 +122,7 @@
         return not rc
 
     def open(self, url, new=1):
-	# XXX currently I know no way to prevent KFM from opening a new win.
+        # XXX currently I know no way to prevent KFM from opening a new win.
         self.open_new(url)
 
     def open_new(self, url):
diff --git a/Lib/whrandom.py b/Lib/whrandom.py
index f43b2f9..a3a9bf7 100644
--- a/Lib/whrandom.py
+++ b/Lib/whrandom.py
@@ -1,21 +1,21 @@
 """Wichman-Hill random number generator.
 
 Wichmann, B. A. & Hill, I. D. (1982)
-Algorithm AS 183: 
+Algorithm AS 183:
 An efficient and portable pseudo-random number generator
 Applied Statistics 31 (1982) 188-190
 
-see also: 
+see also:
         Correction to Algorithm AS 183
-        Applied Statistics 33 (1984) 123  
+        Applied Statistics 33 (1984) 123
 
         McLeod, A. I. (1985)
-        A remark on Algorithm AS 183 
+        A remark on Algorithm AS 183
         Applied Statistics 34 (1985),198-200
 
 
 USE:
-whrandom.random()       yields double precision random numbers 
+whrandom.random()       yields double precision random numbers
                         uniformly distributed between 0 and 1.
 
 whrandom.seed(x, y, z)  must be called before whrandom.random()
@@ -38,96 +38,96 @@
 
 
 class whrandom:
-	def __init__(self, x = 0, y = 0, z = 0):
-		"""Initialize an instance.
-		Without arguments, initialize from current time.
-		With arguments (x, y, z), initialize from them."""
-		self.seed(x, y, z)
+    def __init__(self, x = 0, y = 0, z = 0):
+        """Initialize an instance.
+        Without arguments, initialize from current time.
+        With arguments (x, y, z), initialize from them."""
+        self.seed(x, y, z)
 
-	def seed(self, x = 0, y = 0, z = 0):
-		"""Set the seed from (x, y, z).
-		These must be integers in the range [0, 256)."""
-		if not type(x) == type(y) == type(z) == type(0):
-			raise TypeError, 'seeds must be integers'
-		if not (0 <= x < 256 and 0 <= y < 256 and 0 <= z < 256):
-			raise ValueError, 'seeds must be in range(0, 256)'
-		if 0 == x == y == z:
-			# Initialize from current time
-			import time
-			t = long(time.time() * 256)
-			t = int((t&0xffffff) ^ (t>>24))
-			t, x = divmod(t, 256)
-			t, y = divmod(t, 256)
-			t, z = divmod(t, 256)
-		# Zero is a poor seed, so substitute 1
-		self._seed = (x or 1, y or 1, z or 1)
+    def seed(self, x = 0, y = 0, z = 0):
+        """Set the seed from (x, y, z).
+        These must be integers in the range [0, 256)."""
+        if not type(x) == type(y) == type(z) == type(0):
+            raise TypeError, 'seeds must be integers'
+        if not (0 <= x < 256 and 0 <= y < 256 and 0 <= z < 256):
+            raise ValueError, 'seeds must be in range(0, 256)'
+        if 0 == x == y == z:
+            # Initialize from current time
+            import time
+            t = long(time.time() * 256)
+            t = int((t&0xffffff) ^ (t>>24))
+            t, x = divmod(t, 256)
+            t, y = divmod(t, 256)
+            t, z = divmod(t, 256)
+        # Zero is a poor seed, so substitute 1
+        self._seed = (x or 1, y or 1, z or 1)
 
-	def random(self):
-		"""Get the next random number in the range [0.0, 1.0)."""
-		# This part is thread-unsafe:
-		# BEGIN CRITICAL SECTION
-		x, y, z = self._seed
-		#
-		x = (171 * x) % 30269
-		y = (172 * y) % 30307
-		z = (170 * z) % 30323
-		#
-		self._seed = x, y, z
-		# END CRITICAL SECTION
-		#
-		return (x/30269.0 + y/30307.0 + z/30323.0) % 1.0
+    def random(self):
+        """Get the next random number in the range [0.0, 1.0)."""
+        # This part is thread-unsafe:
+        # BEGIN CRITICAL SECTION
+        x, y, z = self._seed
+        #
+        x = (171 * x) % 30269
+        y = (172 * y) % 30307
+        z = (170 * z) % 30323
+        #
+        self._seed = x, y, z
+        # END CRITICAL SECTION
+        #
+        return (x/30269.0 + y/30307.0 + z/30323.0) % 1.0
 
-	def uniform(self, a, b):
-		"""Get a random number in the range [a, b)."""
-		return a + (b-a) * self.random()
+    def uniform(self, a, b):
+        """Get a random number in the range [a, b)."""
+        return a + (b-a) * self.random()
 
-	def randint(self, a, b):
-		"""Get a random integer in the range [a, b] including
-                both end points.
+    def randint(self, a, b):
+        """Get a random integer in the range [a, b] including
+        both end points.
 
-		(Deprecated; use randrange below.)"""
-		return self.randrange(a, b+1)
+        (Deprecated; use randrange below.)"""
+        return self.randrange(a, b+1)
 
-	def choice(self, seq):
-		"""Choose a random element from a non-empty sequence."""
-		return seq[int(self.random() * len(seq))]
+    def choice(self, seq):
+        """Choose a random element from a non-empty sequence."""
+        return seq[int(self.random() * len(seq))]
 
-	def randrange(self, start, stop=None, step=1, int=int, default=None):
-		"""Choose a random item from range(start, stop[, step]).
+    def randrange(self, start, stop=None, step=1, int=int, default=None):
+        """Choose a random item from range(start, stop[, step]).
 
-		This fixes the problem with randint() which includes the
-		endpoint; in Python this is usually not what you want.
-                Do not supply the 'int' and 'default' arguments."""
-		# This code is a bit messy to make it fast for the
-		# common case while still doing adequate error checking
-		istart = int(start)
-		if istart != start:
-			raise ValueError, "non-integer arg 1 for randrange()"
-		if stop is default:
-			if istart > 0:
-				return int(self.random() * istart)
-			raise ValueError, "empty range for randrange()"
-		istop = int(stop)
-		if istop != stop:
-			raise ValueError, "non-integer stop for randrange()"
-		if step == 1:
-			if istart < istop:
-				return istart + int(self.random() *
-						   (istop - istart))
-			raise ValueError, "empty range for randrange()"
-		istep = int(step)
-		if istep != step:
-			raise ValueError, "non-integer step for randrange()"
-		if istep > 0:
-			n = (istop - istart + istep - 1) / istep
-		elif istep < 0:
-			n = (istop - istart + istep + 1) / istep
-		else:
-			raise ValueError, "zero step for randrange()"
+        This fixes the problem with randint() which includes the
+        endpoint; in Python this is usually not what you want.
+        Do not supply the 'int' and 'default' arguments."""
+        # This code is a bit messy to make it fast for the
+        # common case while still doing adequate error checking
+        istart = int(start)
+        if istart != start:
+            raise ValueError, "non-integer arg 1 for randrange()"
+        if stop is default:
+            if istart > 0:
+                return int(self.random() * istart)
+            raise ValueError, "empty range for randrange()"
+        istop = int(stop)
+        if istop != stop:
+            raise ValueError, "non-integer stop for randrange()"
+        if step == 1:
+            if istart < istop:
+                return istart + int(self.random() *
+                                   (istop - istart))
+            raise ValueError, "empty range for randrange()"
+        istep = int(step)
+        if istep != step:
+            raise ValueError, "non-integer step for randrange()"
+        if istep > 0:
+            n = (istop - istart + istep - 1) / istep
+        elif istep < 0:
+            n = (istop - istart + istep + 1) / istep
+        else:
+            raise ValueError, "zero step for randrange()"
 
-		if n <= 0:
-			raise ValueError, "empty range for randrange()"
-		return istart + istep*int(self.random() * n)
+        if n <= 0:
+            raise ValueError, "empty range for randrange()"
+        return istart + istep*int(self.random() * n)
 
 
 # Initialize from the current time
diff --git a/Lib/xdrlib.py b/Lib/xdrlib.py
index c97975d..621f295 100644
--- a/Lib/xdrlib.py
+++ b/Lib/xdrlib.py
@@ -29,7 +29,7 @@
     pass
 
 
-
+
 class Packer:
     """Pack various data representations into a buffer."""
 
@@ -106,7 +106,7 @@
         self.pack_farray(n, list, pack_item)
 
 
-
+
 class Unpacker:
     """Unpacks various data representations from the given buffer."""
 
@@ -220,7 +220,7 @@
         n = self.unpack_uint()
         return self.unpack_farray(n, unpack_item)
 
-
+
 # test suite
 def _test():
     p = Packer()
@@ -274,6 +274,6 @@
             print 'ConversionError:', var.msg
         count = count + 1
 
-
+
 if __name__ == '__main__':
     _test()
diff --git a/Lib/xmllib.py b/Lib/xmllib.py
index 8bca0fc..f09ba90 100644
--- a/Lib/xmllib.py
+++ b/Lib/xmllib.py
@@ -250,9 +250,9 @@
                 break
             res = interesting.search(rawdata, i)
             if res:
-                    j = res.start(0)
+                j = res.start(0)
             else:
-                    j = n
+                j = n
             if i < j:
                 data = rawdata[i:j]
                 if self.__at_start and space.match(data) is None:
diff --git a/Lib/zipfile.py b/Lib/zipfile.py
index 3a40dcb..1c2b0de 100644
--- a/Lib/zipfile.py
+++ b/Lib/zipfile.py
@@ -6,13 +6,13 @@
 import binascii
 
 try:
-    import zlib	# We may need its compression method
+    import zlib # We may need its compression method
 except:
     zlib = None
 
 class BadZipfile(Exception):
     pass
-error = BadZipfile	# The exception raised by this module
+error = BadZipfile      # The exception raised by this module
 
 # constants for Zip file compression methods
 ZIP_STORED = 0
@@ -35,11 +35,11 @@
     """
     try:
         fpin = open(filename, "rb")
-        fpin.seek(-22, 2)		# Seek to end-of-file record
+        fpin.seek(-22, 2)               # Seek to end-of-file record
         endrec = fpin.read()
         fpin.close()
         if endrec[0:4] == "PK\005\006" and endrec[-2:] == "\000\000":
-            return 1	# file has correct magic number
+            return 1    # file has correct magic number
     except:
         pass
 
@@ -48,26 +48,26 @@
     """Class with attributes describing each file in the ZIP archive."""
 
     def __init__(self, filename="NoName", date_time=(1980,1,1,0,0,0)):
-        self.filename = filename	# Name of the file in the archive
-        self.date_time = date_time	# year, month, day, hour, min, sec
+        self.filename = filename        # Name of the file in the archive
+        self.date_time = date_time      # year, month, day, hour, min, sec
         # Standard values:
-        self.compress_type = ZIP_STORED	# Type of compression for the file
-        self.comment = ""		# Comment for each file
-        self.extra = ""			# ZIP extra data
-        self.create_system = 0		# System which created ZIP archive
-        self.create_version = 20	# Version which created ZIP archive
-        self.extract_version = 20	# Version needed to extract archive
-        self.reserved = 0		# Must be zero
-        self.flag_bits = 0		# ZIP flag bits
-        self.volume = 0			# Volume number of file header
-        self.internal_attr = 0		# Internal attributes
-        self.external_attr = 0		# External file attributes
+        self.compress_type = ZIP_STORED # Type of compression for the file
+        self.comment = ""               # Comment for each file
+        self.extra = ""                 # ZIP extra data
+        self.create_system = 0          # System which created ZIP archive
+        self.create_version = 20        # Version which created ZIP archive
+        self.extract_version = 20       # Version needed to extract archive
+        self.reserved = 0               # Must be zero
+        self.flag_bits = 0              # ZIP flag bits
+        self.volume = 0                 # Volume number of file header
+        self.internal_attr = 0          # Internal attributes
+        self.external_attr = 0          # External file attributes
         # Other attributes are set by class ZipFile:
-        # header_offset		Byte offset to the file header
-        # file_offset		Byte offset to the start of the file data
-        # CRC			CRC-32 of the uncompressed file
-        # compress_size		Size of the compressed file
-        # file_size		Size of the uncompressed file
+        # header_offset         Byte offset to the file header
+        # file_offset           Byte offset to the start of the file data
+        # CRC                   CRC-32 of the uncompressed file
+        # compress_size         Size of the compressed file
+        # file_size             Size of the uncompressed file
 
     def FileHeader(self):
         """Return the per-file header as a string."""
@@ -75,12 +75,12 @@
         dosdate = (dt[0] - 1980) << 9 | dt[1] << 5 | dt[2]
         dostime = dt[3] << 11 | dt[4] << 5 | dt[5] / 2
         if self.flag_bits & 0x08:
-          # Set these to zero because we write them after the file data
-          CRC = compress_size = file_size = 0
+            # Set these to zero because we write them after the file data
+            CRC = compress_size = file_size = 0
         else:
-          CRC = self.CRC
-          compress_size = self.compress_size
-          file_size = self.file_size
+            CRC = self.CRC
+            compress_size = self.compress_size
+            file_size = self.file_size
         header = struct.pack(structFileHeader, stringFileHeader,
                  self.extract_version, self.reserved, self.flag_bits,
                  self.compress_type, dostime, dosdate, CRC,
@@ -102,10 +102,10 @@
                       "Compression requires the (missing) zlib module"
         else:
             raise RuntimeError, "That compression method is not supported"
-        self.debug = 0	# Level of printing: 0 through 3
-        self.NameToInfo = {}	# Find file info given name
-        self.filelist = []	# List of ZipInfo instances for archive
-        self.compression = compression	# Method of compression
+        self.debug = 0  # Level of printing: 0 through 3
+        self.NameToInfo = {}    # Find file info given name
+        self.filelist = []      # List of ZipInfo instances for archive
+        self.compression = compression  # Method of compression
         self.filename = filename
         self.mode = key = mode[0]
         if key == 'r':
@@ -115,14 +115,14 @@
             self.fp = open(filename, "wb")
         elif key == 'a':
             fp = self.fp = open(filename, "r+b")
-            fp.seek(-22, 2)		# Seek to end-of-file record
+            fp.seek(-22, 2)             # Seek to end-of-file record
             endrec = fp.read()
             if endrec[0:4] == stringEndArchive and \
                        endrec[-2:] == "\000\000":
-                self._GetContents()	# file is a zip file
+                self._GetContents()     # file is a zip file
                 # seek to start of directory and overwrite
                 fp.seek(self.start_dir, 0)
-            else:		# file is not a zip file, just append
+            else:               # file is not a zip file, just append
                 fp.seek(0, 2)
         else:
             raise RuntimeError, 'Mode must be "r", "w" or "a"'
@@ -130,16 +130,16 @@
     def _GetContents(self):
         """Read in the table of contents for the ZIP file."""
         fp = self.fp
-        fp.seek(-22, 2)		# Start of end-of-archive record
-        filesize = fp.tell() + 22	# Get file size
-        endrec = fp.read(22)	# Archive must not end with a comment!
+        fp.seek(-22, 2)         # Start of end-of-archive record
+        filesize = fp.tell() + 22       # Get file size
+        endrec = fp.read(22)    # Archive must not end with a comment!
         if endrec[0:4] != stringEndArchive or endrec[-2:] != "\000\000":
             raise BadZipfile, "File is not a zip file, or ends with a comment"
         endrec = struct.unpack(structEndArchive, endrec)
         if self.debug > 1:
             print endrec
-        size_cd = endrec[5]		# bytes in central directory
-        offset_cd = endrec[6]	# offset of central directory
+        size_cd = endrec[5]             # bytes in central directory
+        offset_cd = endrec[6]   # offset of central directory
         x = filesize - 22 - size_cd
         # "concat" is zero, unless zip was concatenated to another file
         concat = x - offset_cd
@@ -211,7 +211,7 @@
         """Read all the files and check the CRC."""
         for zinfo in self.filelist:
             try:
-                self.read(zinfo.filename)	# Check CRC-32
+                self.read(zinfo.filename)       # Check CRC-32
             except:
                 return zinfo.filename
 
@@ -256,7 +256,7 @@
     def _writecheck(self, zinfo):
         """Check for errors before writing a file to the archive."""
         if self.NameToInfo.has_key(zinfo.filename):
-            if self.debug:	# Warning for duplicate names
+            if self.debug:      # Warning for duplicate names
                 print "Duplicate name:", zinfo.filename
         if self.mode not in ("w", "a"):
             raise RuntimeError, 'write() requires mode "w" or "a"'
@@ -278,20 +278,20 @@
         date_time = mtime[0:6]
         # Create ZipInfo instance to store file information
         if arcname is None:
-          zinfo = ZipInfo(filename, date_time)
+            zinfo = ZipInfo(filename, date_time)
         else:
-          zinfo = ZipInfo(arcname, date_time)
-        zinfo.external_attr = st[0] << 16	# Unix attributes
+            zinfo = ZipInfo(arcname, date_time)
+        zinfo.external_attr = st[0] << 16       # Unix attributes
         if compress_type is None:
-          zinfo.compress_type = self.compression
+            zinfo.compress_type = self.compression
         else:
-          zinfo.compress_type = compress_type
+            zinfo.compress_type = compress_type
         self._writecheck(zinfo)
         fp = open(filename, "rb")
         zinfo.flag_bits = 0x08
-        zinfo.header_offset = self.fp.tell()	# Start of header bytes
+        zinfo.header_offset = self.fp.tell()    # Start of header bytes
         self.fp.write(zinfo.FileHeader())
-        zinfo.file_offset = self.fp.tell()	# Start of file bytes
+        zinfo.file_offset = self.fp.tell()      # Start of file bytes
         CRC = 0
         compress_size = 0
         file_size = 0
@@ -330,23 +330,23 @@
         """Write a file into the archive.  The contents is the string
         'bytes'."""
         self._writecheck(zinfo)
-        zinfo.file_size = len(bytes)		# Uncompressed size
-        zinfo.CRC = binascii.crc32(bytes)	# CRC-32 checksum
+        zinfo.file_size = len(bytes)            # Uncompressed size
+        zinfo.CRC = binascii.crc32(bytes)       # CRC-32 checksum
         if zinfo.compress_type == ZIP_DEFLATED:
             co = zlib.compressobj(zlib.Z_DEFAULT_COMPRESSION,
                  zlib.DEFLATED, -15)
             bytes = co.compress(bytes) + co.flush()
-            zinfo.compress_size = len(bytes)	# Compressed size
+            zinfo.compress_size = len(bytes)    # Compressed size
         else:
             zinfo.compress_size = zinfo.file_size
-        zinfo.header_offset = self.fp.tell()	# Start of header bytes
+        zinfo.header_offset = self.fp.tell()    # Start of header bytes
         self.fp.write(zinfo.FileHeader())
-        zinfo.file_offset = self.fp.tell()	# Start of file bytes
+        zinfo.file_offset = self.fp.tell()      # Start of file bytes
         self.fp.write(bytes)
         if zinfo.flag_bits & 0x08:
-          # Write CRC and file sizes after the file data
-          self.fp.write(struct.pack("<lll", zinfo.CRC, zinfo.compress_size,
-                zinfo.file_size))
+            # Write CRC and file sizes after the file data
+            self.fp.write(struct.pack("<lll", zinfo.CRC, zinfo.compress_size,
+                  zinfo.file_size))
         self.filelist.append(zinfo)
         self.NameToInfo[zinfo.filename] = zinfo
 
@@ -359,10 +359,10 @@
     def close(self):
         """Close the file, and for mode "w" and "a" write the ending
         records."""
-        if self.mode in ("w", "a"):		# write ending records
+        if self.mode in ("w", "a"):             # write ending records
             count = 0
             pos1 = self.fp.tell()
-            for zinfo in self.filelist:		# write central directory
+            for zinfo in self.filelist:         # write central directory
                 count = count + 1
                 dt = zinfo.date_time
                 dosdate = (dt[0] - 1980) << 9 | dt[1] << 5 | dt[2]
@@ -468,7 +468,7 @@
         file_pyo = pathname + ".pyo"
         if os.path.isfile(file_pyo) and \
                             os.stat(file_pyo)[8] >= os.stat(file_py)[8]:
-            fname = file_pyo	# Use .pyo file
+            fname = file_pyo    # Use .pyo file
         elif not os.path.isfile(file_pyc) or \
              os.stat(file_pyc)[8] < os.stat(file_py)[8]:
             import py_compile