Extract the comments from the C/C++ style source code to the same name add .cmt ext name. Usage is python extractcomment.py topdir .ext1 .ext2 ... You can set the encoding to read and write file correctly. Reference the source here http://www.cppblog.com/luyulaile/archive/2012/12/03/195907.html

extractcomment.py

#!/usr/bin/env python

import sys
import re
import os.path
import codecs
import os

encoding = 'cp932'

def comment_finder(text):
    pattern = re.compile( r'//.*?$|/\*.*?\*/', re.DOTALL | re.MULTILINE)
    result = pattern.findall(text)
    return result

def print_command(filename):

    codefile = codecs.open(filename,'r', encoding)
    commentfile = codecs.open(filename+".cmt",'w', encoding)
    lines=codefile.read()
    codefile.close()
    #the list of comments
    list_of_comments = comment_finder(lines)
    for comment in list_of_comments:
        #print comment[0:2]
        if comment[0:2] == "//":
                comment_to_write = comment[2:]
        else:
            comment_to_write = comment[2:-2]
        if comment_to_write.endswith("\r"):
            comment_to_write = comment_to_write[0:-1]
        if len(comment_to_write)!=0:
            commentfile.write(comment_to_write)
            commentfile.write(os.linesep)
    commentfile.close()

def visitor(filters, dirname, names):
    mynames = filter(lambda n : os.path.splitext(n)[1].lower() in filters, names)
    for name in mynames:
        fname = os.path.join(dirname, name)
        if not os.path.isdir(fname):
            print_command(fname)
'''
Usage:
    python extract.py topdir .ext1 [.ext2]
'''
if __name__ == "__main__":
    topdir = sys.argv[1]

    filters = sys.argv[2:]

    os.path.walk(topdir, visitor, filters)