REGULAAAAAAR EXPREEEESSSIIIIOOOOOONS. GO!

TODO nested sub signatures
TODO start
TODO flattening
Update python.html.markdown

Added more details to try/except section.
Update python3.html.markdown

Added more info to try/except. Corrected some trivial bugs.
Merge pull request #696 from Shashwat986/master

Updated python and python3 with try/except details
Update python.html.markdown

range() is not a generator in python 2.x
Merge pull request #698 from Shashwat986/patch-1

Update python.html.markdown
Minor fixes to return values.
Merge pull request #710 from patzim/master

Minor fixes to return values.
Squashed commits to prepare for merge
moved underscore for range variable, added comment

renamed parameter in beg decorator

added comment about double underscores

Update python.html.markdown