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pythontypesparameters
John Doe
John Doe

Reputation: 1639

python : function type parameter

Is there a way to enforce the type of a variable in a python function ? Or at least, give an indication of what it should be ? I already saw things like :

var -> int

But I don't know the name of that syntax, nor its use.

Thanks

Upvotes: 1

Views: 114

Answers (1)

Mike Scotty
Mike Scotty

Reputation: 10782

It's called Type Hints, has been introduced in Python 3.5 and is described here: https://docs.python.org/3/library/typing.html

See also PEP 484: https://www.python.org/dev/peps/pep-0484/

Example:

def greeting(name: str) -> str:
    return 'Hello ' + name

Note that this will not enforce the type.

From the PEP:

While these annotations are available at runtime through the usual __annotations__ attribute, no type checking happens at runtime. Instead, the proposal assumes the existence of a separate off-line type checker which users can run over their source code voluntarily.

Upvotes: 3

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