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diff --git a/lib/python2.7/Tools/scripts/methfix.py b/lib/python2.7/Tools/scripts/methfix.py
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+++ b/lib/python2.7/Tools/scripts/methfix.py
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+#!/usr/bin/env python2
+
+# Fix Python source files to avoid using
+#       def method(self, (arg1, ..., argn)):
+# instead of the more rational
+#       def method(self, arg1, ..., argn):
+#
+# Command line arguments are files or directories to be processed.
+# Directories are searched recursively for files whose name looks
+# like a python module.
+# Symbolic links are always ignored (except as explicit directory
+# arguments).  Of course, the original file is kept as a back-up
+# (with a "~" attached to its name).
+# It complains about binaries (files containing null bytes)
+# and about files that are ostensibly not Python files: if the first
+# line starts with '#!' and does not contain the string 'python'.
+#
+# Changes made are reported to stdout in a diff-like format.
+#
+# Undoubtedly you can do this using find and sed or perl, but this is
+# a nice example of Python code that recurses down a directory tree
+# and uses regular expressions.  Also note several subtleties like
+# preserving the file's mode and avoiding to even write a temp file
+# when no changes are needed for a file.
+#
+# NB: by changing only the function fixline() you can turn this
+# into a program for a different change to Python programs...
+
+import sys
+import re
+import os
+from stat import *
+
+err = sys.stderr.write
+dbg = err
+rep = sys.stdout.write
+
+def main():
+    bad = 0
+    if not sys.argv[1:]: # No arguments
+        err('usage: ' + sys.argv[0] + ' file-or-directory ...\n')
+        sys.exit(2)
+    for arg in sys.argv[1:]:
+        if os.path.isdir(arg):
+            if recursedown(arg): bad = 1
+        elif os.path.islink(arg):
+            err(arg + ': will not process symbolic links\n')
+            bad = 1
+        else:
+            if fix(arg): bad = 1
+    sys.exit(bad)
+
+ispythonprog = re.compile('^[a-zA-Z0-9_]+\.py$')
+def ispython(name):
+    return ispythonprog.match(name) >= 0
+
+def recursedown(dirname):
+    dbg('recursedown(%r)\n' % (dirname,))
+    bad = 0
+    try:
+        names = os.listdir(dirname)
+    except os.error, msg:
+        err('%s: cannot list directory: %r\n' % (dirname, msg))
+        return 1
+    names.sort()
+    subdirs = []
+    for name in names:
+        if name in (os.curdir, os.pardir): continue
+        fullname = os.path.join(dirname, name)
+        if os.path.islink(fullname): pass
+        elif os.path.isdir(fullname):
+            subdirs.append(fullname)
+        elif ispython(name):
+            if fix(fullname): bad = 1
+    for fullname in subdirs:
+        if recursedown(fullname): bad = 1
+    return bad
+
+def fix(filename):
+##  dbg('fix(%r)\n' % (filename,))
+    try:
+        f = open(filename, 'r')
+    except IOError, msg:
+        err('%s: cannot open: %r\n' % (filename, msg))
+        return 1
+    head, tail = os.path.split(filename)
+    tempname = os.path.join(head, '@' + tail)
+    g = None
+    # If we find a match, we rewind the file and start over but
+    # now copy everything to a temp file.
+    lineno = 0
+    while 1:
+        line = f.readline()
+        if not line: break
+        lineno = lineno + 1
+        if g is None and '\0' in line:
+            # Check for binary files
+            err(filename + ': contains null bytes; not fixed\n')
+            f.close()
+            return 1
+        if lineno == 1 and g is None and line[:2] == '#!':
+            # Check for non-Python scripts
+            words = line[2:].split()
+            if words and re.search('[pP]ython', words[0]) < 0:
+                msg = filename + ': ' + words[0]
+                msg = msg + ' script; not fixed\n'
+                err(msg)
+                f.close()
+                return 1
+        while line[-2:] == '\\\n':
+            nextline = f.readline()
+            if not nextline: break
+            line = line + nextline
+            lineno = lineno + 1
+        newline = fixline(line)
+        if newline != line:
+            if g is None:
+                try:
+                    g = open(tempname, 'w')
+                except IOError, msg:
+                    f.close()
+                    err('%s: cannot create: %r\n' % (tempname, msg))
+                    return 1
+                f.seek(0)
+                lineno = 0
+                rep(filename + ':\n')
+                continue # restart from the beginning
+            rep(repr(lineno) + '\n')
+            rep('< ' + line)
+            rep('> ' + newline)
+        if g is not None:
+            g.write(newline)
+
+    # End of file
+    f.close()
+    if not g: return 0 # No changes
+
+    # Finishing touch -- move files
+
+    # First copy the file's mode to the temp file
+    try:
+        statbuf = os.stat(filename)
+        os.chmod(tempname, statbuf[ST_MODE] & 07777)
+    except os.error, msg:
+        err('%s: warning: chmod failed (%r)\n' % (tempname, msg))
+    # Then make a backup of the original file as filename~
+    try:
+        os.rename(filename, filename + '~')
+    except os.error, msg:
+        err('%s: warning: backup failed (%r)\n' % (filename, msg))
+    # Now move the temp file to the original file
+    try:
+        os.rename(tempname, filename)
+    except os.error, msg:
+        err('%s: rename failed (%r)\n' % (filename, msg))
+        return 1
+    # Return succes
+    return 0
+
+
+fixpat = '^[ \t]+def +[a-zA-Z0-9_]+ *( *self *, *(( *(.*) *)) *) *:'
+fixprog = re.compile(fixpat)
+
+def fixline(line):
+    if fixprog.match(line) >= 0:
+        (a, b), (c, d) = fixprog.regs[1:3]
+        line = line[:a] + line[c:d] + line[b:]
+    return line
+
+if __name__ == '__main__':
+    main()