Script to add a basic README.md file to many repositories in a directory

AddReadmeToRepos.py

#!/usr/bin/python
# -*- coding: utf-8  -*-
# Copyright © 2014 He7d3r
# License: http://he7d3r.mit-license.org/
""" Script to add a basic README.md file to many repositories in a directory"""
import os
import sh

rootDir = '/home/username/GitHub/'
myFile = 'README.md'
prefix = 'mw-gadget-'
commitMessage = 'Add a README with installation instructions'
readme = """Installation
===========================

1. Go to one of the js subpages of your user page. You can choose a page such as these:
  * [meta:User:`<Name>`/global.js](https://meta.wikimedia.org/wiki/Special:MyPage/global.js), which will be loaded in all wikis, in all skins
  * [meta:User:`<Name>`/common.js](https://meta.wikimedia.org/wiki/Special:MyPage/common.js), which will be loaded only on Meta-wiki, in all skins
  * [meta:User:`<Name>`/vector.js](https://meta.wikimedia.org/wiki/Special:MyPage/vector.js), which will be loaded only on Meta-wiki, in the vector skin
2. Copy the following to the page you have chosen:

  ```javascript
  // [[File:User:He7d3r/Tools/{0}.js]] (workaround for [[bugzilla:33355]])
  mw.loader.load( '//meta.wikimedia.org/w/index.php?title=User:He7d3r/Tools/{0}.js&action=raw&ctype=text/javascript' );
  ```

3. Clear the cache of your browser.

This will import the minified copy of the script I maintain on Meta-wiki."""

def main(*args):
    for repo in os.walk(rootDir).next()[1]:
        readmePath = rootDir + repo + '/' + myFile
        if not os.path.exists(readmePath):
            print( repo )
            f = open( readmePath, 'w' )
            f.write( readme.format(repo[len(prefix):]).encode( 'utf8' ) )
            f.close()
            # Set up git
            git = sh.git.bake( _cwd = rootDir + repo )
            print(git.add( '--all' ))
            print(git.commit( m = commitMessage ))
            print(git.push())

if __name__ == '__main__':
    main()