Python GIL: Global Interpreter Lock

Python: Put simply, generators are special coroutines

Python: Yes, coroutines are complicated, but they can be used as simply as generators

Python: IDLE won't display anything for an expression evaluated to None

Python: raise / 3 key elements of an exception

Python: except

Python: with-statement / variable scope in with-statement

Python: try-except-else-finally

Python: Variable scope in if-statement