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("comments.cmt",'a', 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 "Analyzing " + fname
            print_command(fname)

if __name__ == "__main__":
    if len(sys.argv) < 3:
        print "Usage:"
        print "    python extractcomment.py topdir .ext1 [.ext2]"
        print "e.g.:"
        print "    python extractcomment.py . .swift .m .h"
    else:
        topdir = sys.argv[1]
        filters = sys.argv[2:]
        os.path.walk(topdir, visitor, filters)
        print "Comments output to comments.cmt"