Add type annotations (python 3.5) for static typing

To get a strongly typed code, we can use typing annotations and the typing module.

To type-check the code before run-time, we can use our IDE integrated type checking, or better :

• mypy
• pyre

A video about typing : https://hooktube.com/watch?v=QCGwDOk-pIs

changed milestone to %0.50.0

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Use mypy. All errors raised by mypy are corrected.

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changed title from Add type annotations for static typing to Add type annotations (python 3.5) for static typing

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mentioned in issue silkaj#7 (closed)

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