Run these demo scripts through reindent.py to give them 4-space indents.  I've verified that their output is unchanged.
diff --git a/Demo/comparisons/systemtest.py b/Demo/comparisons/systemtest.py
index f2533b1..bbc313b 100755
--- a/Demo/comparisons/systemtest.py
+++ b/Demo/comparisons/systemtest.py
@@ -1,7 +1,7 @@
 #! /usr/bin/env python
 
 # 3)  System Test
-# 
+#
 #     Given a list of directories, report any bogus symbolic links contained
 #     anywhere in those subtrees.  A bogus symbolic link is one that cannot
 #     be resolved because it points to a nonexistent or otherwise
@@ -21,54 +21,54 @@
 from stat import *
 
 def main():
-	try:
-		# Note: can't test for presence of lstat -- it's always there
-		dummy = os.readlink
-	except AttributeError:
-		print "This system doesn't have symbolic links"
-		sys.exit(0)
-	if sys.argv[1:]:
-		prefix = sys.argv[1]
-	else:
-		prefix = ''
-	if prefix:
-		os.chdir(prefix)
-		if prefix[-1:] != '/': prefix = prefix + '/'
-		reportboguslinks(prefix)
-	else:
-		reportboguslinks('')
+    try:
+        # Note: can't test for presence of lstat -- it's always there
+        dummy = os.readlink
+    except AttributeError:
+        print "This system doesn't have symbolic links"
+        sys.exit(0)
+    if sys.argv[1:]:
+        prefix = sys.argv[1]
+    else:
+        prefix = ''
+    if prefix:
+        os.chdir(prefix)
+        if prefix[-1:] != '/': prefix = prefix + '/'
+        reportboguslinks(prefix)
+    else:
+        reportboguslinks('')
 
 def reportboguslinks(prefix):
-	try:
-		names = os.listdir('.')
-	except os.error, msg:
-		print "%s%s: can't list: %s" % (prefix, '.', msg)
-		return
-	names.sort()
-	for name in names:
-		if name == os.curdir or name == os.pardir:
-			continue
-		try:
-			mode = os.lstat(name)[ST_MODE]
-		except os.error:
-			print "%s%s: can't stat: %s" % (prefix, name, msg)
-			continue
-		if S_ISLNK(mode):
-			try:
-				os.stat(name)
-			except os.error:
-				print "%s%s -> %s" % \
-				      (prefix, name, os.readlink(name))
-		elif S_ISDIR(mode):
-			try:
-				os.chdir(name)
-			except os.error, msg:
-				print "%s%s: can't chdir: %s" % \
-				      (prefix, name, msg)
-				continue
-			try:
-				reportboguslinks(prefix + name + '/')
-			finally:
-				os.chdir('..')
+    try:
+        names = os.listdir('.')
+    except os.error, msg:
+        print "%s%s: can't list: %s" % (prefix, '.', msg)
+        return
+    names.sort()
+    for name in names:
+        if name == os.curdir or name == os.pardir:
+            continue
+        try:
+            mode = os.lstat(name)[ST_MODE]
+        except os.error:
+            print "%s%s: can't stat: %s" % (prefix, name, msg)
+            continue
+        if S_ISLNK(mode):
+            try:
+                os.stat(name)
+            except os.error:
+                print "%s%s -> %s" % \
+                      (prefix, name, os.readlink(name))
+        elif S_ISDIR(mode):
+            try:
+                os.chdir(name)
+            except os.error, msg:
+                print "%s%s: can't chdir: %s" % \
+                      (prefix, name, msg)
+                continue
+            try:
+                reportboguslinks(prefix + name + '/')
+            finally:
+                os.chdir('..')
 
 main()