Catalin George Festila: Python 3.7.5 : About PEP 3107.

The PEP 3107 introduces a syntax for adding arbitrary metadata annotations to Python functions. The function annotations refer to syntax parameters with an expression. def my_function(x: expression, y: expression = 5): ... For example: >>> def show(myvar:np.float64): ... print(type(myvar)) ... print(myvar) ... >>> show(1.1) 1.1 >>> def files(filename: str, dot='.') -> list: ...

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