added useful links
added useful links
multiple list sorting
imgs for matcheat
some progress on matrix cheat sheet
matrix cheatsheet finished
running cython
contain method
contain method
contain method
fixed typo
fix xrange py2
links to python resources
upd. algorithm cat.
fixed link
refined numpy syntax
python logo
random string generator
Merge branch 'master' of https://github.com/rasbt/python_reference
random string generator