diff --git a/Tools/scripts/byteyears.py b/Tools/scripts/byteyears.py
index 06f7559..c0aea70 100755
--- a/Tools/scripts/byteyears.py
+++ b/Tools/scripts/byteyears.py
@@ -17,13 +17,13 @@
 	statfunc = posix.stat
 
 # Parse options
-if sys.argv[1] = '-m':
+if sys.argv[1] == '-m':
 	itime = ST_MTIME
 	del sys.argv[1]
-elif sys.argv[1] = '-c':
+elif sys.argv[1] == '-c':
 	itime = ST_CTIME
 	del sys.argv[1]
-elif sys.argv[1] = '-a':
+elif sys.argv[1] == '-a':
 	itime = ST_CTIME
 	del sys.argv[1]
 else:
diff --git a/Tools/scripts/checkpyc.py b/Tools/scripts/checkpyc.py
index 152fb1d..54396a3 100755
--- a/Tools/scripts/checkpyc.py
+++ b/Tools/scripts/checkpyc.py
@@ -10,9 +10,9 @@
 	silent = 0
 	verbose = 0
 	if sys.argv[1:]:
-		if sys.argv[1] = '-v':
+		if sys.argv[1] == '-v':
 			verbose = 1
-		elif sys.argv[1] = '-s':
+		elif sys.argv[1] == '-s':
 			silent = 1
 	MAGIC = '\0\0\0\0'
 	try:
@@ -32,7 +32,7 @@
 			print 'Checking', `dirname`, '...'
 		names.sort()
 		for name in names:
-			if name[-3:] = '.py':
+			if name[-3:] == '.py':
 				name = path.join(dirname, name)
 				try:
 					st = posix.stat(name)
@@ -55,7 +55,7 @@
 					print `name_c`
 					continue
 				mtime = get_long(mtime_str)
-				if mtime = 0 or mtime = -1:
+				if mtime == 0 or mtime == -1:
 					print 'Bad ".pyc" file', `name_c`
 				elif mtime <> st[ST_MTIME]:
 					print 'Out-of-date ".pyc" file',
diff --git a/Tools/scripts/findlinksto.py b/Tools/scripts/findlinksto.py
index 9398514..a8051c1 100755
--- a/Tools/scripts/findlinksto.py
+++ b/Tools/scripts/findlinksto.py
@@ -17,7 +17,7 @@
 		name = path.join(dirname, name)
 		try:
 			linkto = posix.readlink(name)
-			if linkto[:n] = pattern:
+			if linkto[:n] == pattern:
 				print name, '->', linkto
 		except posix.error:
 			pass
diff --git a/Tools/scripts/objgraph.py b/Tools/scripts/objgraph.py
index b45bba2..a21797d 100755
--- a/Tools/scripts/objgraph.py
+++ b/Tools/scripts/objgraph.py
@@ -170,18 +170,18 @@
 		return 1
 	optu = optc = optd = 0
 	for opt, void in optlist:
-		if opt = '-u':
+		if opt == '-u':
 			optu = 1
-		elif opt = '-c':
+		elif opt == '-c':
 			optc = 1
-		elif opt = '-d':
+		elif opt == '-d':
 			optd = 1
-	if optu = optc = optd = 0:
+	if optu == optc == optd == 0:
 		optu = optc = optd = 1
 	if not args:
 		args = ['-']
 	for file in args:
-		if file = '-':
+		if file == '-':
 			readinput(sys.stdin)
 		else:
 			readinput(open(file, 'r'))
diff --git a/Tools/scripts/pdeps.py b/Tools/scripts/pdeps.py
index 2533015..df20894 100755
--- a/Tools/scripts/pdeps.py
+++ b/Tools/scripts/pdeps.py
@@ -67,13 +67,13 @@
 def process(filename, table):
 	fp = open(filename, 'r')
 	mod = path.basename(filename)
-	if mod[-3:] = '.py':
+	if mod[-3:] == '.py':
 		mod = mod[:-3]
 	table[mod] = list = []
 	while 1:
 		line = fp.readline()
 		if not line: break
-		while line[-1:] = '\\':
+		while line[-1:] == '\\':
 			nextline = fp.readline()
 			if not nextline: break
 			line = line[:-1] + nextline
diff --git a/Tools/scripts/ptags.py b/Tools/scripts/ptags.py
index b3a693e..fdf7bd1 100755
--- a/Tools/scripts/ptags.py
+++ b/Tools/scripts/ptags.py
@@ -33,7 +33,7 @@
 		print 'Cannot open', file
 		return
 	base = path.basename(file)
-	if base[-3:] = '.py': base = base[:-3]
+	if base[-3:] == '.py': base = base[:-3]
 	s = base + '\t' + file + '\t' + '1\n'
 	tags.append(s)
 	while 1:
diff --git a/Tools/scripts/suff.py b/Tools/scripts/suff.py
index 7fda113..a92557c 100755
--- a/Tools/scripts/suff.py
+++ b/Tools/scripts/suff.py
@@ -22,7 +22,7 @@
 def getsuffix(file):
 	suff = ''
 	for i in range(len(file)):
-		if file[i] = '.':
+		if file[i] == '.':
 			suff = file[i:]
 	return suff
 
diff --git a/Tools/scripts/which.py b/Tools/scripts/which.py
index b36c5ca..24071f4 100755
--- a/Tools/scripts/which.py
+++ b/Tools/scripts/which.py
@@ -23,7 +23,7 @@
 				mode = S_IMODE(st[ST_MODE])
 				if mode % 2 or mode/8 % 2 or mode/64 % 2:
 					if ident:
-						if st[:3] = ident:
+						if st[:3] == ident:
 							s = ': same as '
 						else:
 							s = ': also '
diff --git a/Tools/scripts/xxci.py b/Tools/scripts/xxci.py
index ef4ff11..27bb71d 100755
--- a/Tools/scripts/xxci.py
+++ b/Tools/scripts/xxci.py
@@ -50,19 +50,19 @@
 	# Skip executables
 	try:
 		data = open(file, 'r').read(len(EXECMAGIC))
-		if data = EXECMAGIC: return 1
+		if data == EXECMAGIC: return 1
 	except:
 		pass
 	return 0
 
 def badprefix(file):
 	for bad in badprefixes:
-		if file[:len(bad)] = bad: return 1
+		if file[:len(bad)] == bad: return 1
 	return 0
 
 def badsuffix(file):
 	for bad in badsuffixes:
-		if file[-len(bad):] = bad: return 1
+		if file[-len(bad):] == bad: return 1
 	return 0
 
 def go(args):