python disk usage - Google Search

python md5 - Google Search

Md5 from python different then md5 from command line

10.3 md5 -- MD5 message digest algorithm

The md5 module

Python Library Reference

11.1 os.path -- Common pathname manipulations

11.3 stat -- Interpreting stat() results

14.1 os -- Miscellaneous operating system interfaces

14.1.4 Files and Directories