Return not exiting function??

[buran]

you call the function with argument i==3. It execute the if part (i.e. prints ++++++), because you call the function recursively when you call foo with i==5, it returns the what ever. You just throw it away and then it continues on line 10 and prints "why is this printing?" and then it exit the function (and return default None, because there is no explicit return.
It NEVER enters the elif block and never execute line 8 (where the only [explicit] return in the function is).

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Try this site http://www.pythontutor.com/visualize.html
to visualise the execution and get better understanding
And by the way, don't use python2, use python3 instead. python2 is dead.