Github markdown fixer script in python

github-markdown-fixer.py

import sys
import os
import glob
import re
import codecs

def fixItRalph(dirPath):
    #List of Regular Expressions need to apply
    changeRules = [
        { 'find': r'^(#+)([^ #].+)$', 'replaceWith': r'\1 \2' }, #Header Elements fixers
        { 'find': r'(\[.+?\])\s+(\(.*?\))', 'replaceWith': r'\1\2'} #URL Link elements fixers
    ];

    files = glob.glob(dirPath + "/**/*.md", recursive=True)
    tmp_file = 'tmp.md'

    for file in files:
        with codecs.open(file, 'r', encoding='utf8') as fi, \
            codecs.open(tmp_file, 'w', encoding='utf8') as fo:
            for line in fi:
                for rule in changeRules:
                    line = re.sub(rule['find'], rule['replaceWith'], line, flags=re.MULTILINE)

                fo.write(line)

        os.remove(file) # remove original
        os.rename(tmp_file, file) # rename temp to original name


if __name__ == "__main__":
    dirPath = sys.argv[1] if (len(sys.argv) >=2) else os.getcwd()
    fixItRalph(dirPath)

I wrote the first version of this code using fileinput module of python to edit the file in 'inplace' mode. But there was a problem with the script that it didn't work properly with the markdown file contains 'Unicode' characters.
Then I re-wrote it using the codecs module of python with the proper encoding.