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Mon May 25 15:40:17 CEST 2015 · https://mail.python.org/pipermail/python-dev/2015-May/140171.html

On Mon, May 25, 2015, at 04:02, Mike Kozulya wrote:
> May I suggest to eliminate "->" in function definition?
> 
>      def function1 (variable1: variable1_type, variable2: 
> variable2_type): function1_type
>          return str2function1_type(str(variable1)+str('
>          ')+str(variable2))
> 
> OR
> 
>      def function1: function1_type (variable1: variable1_type, 
> variable2: variable2_type):
>          return str2function1_type(str(variable1)+str('
>          ')+str(variable2))
> 
> both look a bit simpler than
> 
>      def function1 (variable1: variable1_type, variable2: 
> variable2_type) -> function1_type:
>          return str2function1_type(str(variable1)+str('
>          ')+str(variable2))
> 
> Are there any convincing reasons to introduce syntactic sugar?

That's simply preexisting function annotation syntax.
https://www.python.org/dev/peps/pep-3107/

It's not invented by the type hinting pep.

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Showing content from https://mail.python.org/pipermail/python-dev/2015-May/140171.html below:

[Python-Dev] PEP 484