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I saw a python example today and it used -> for example this was what I saw:
spam = None bacon = 42 def monty_python(a:spam,b:bacon) -> "different:": pass
What is that code doing? I’m not quite sure I’ve never seen code like that I don’t really get what
is doing either, can someone explain this for me? I googled, “what does -> do in python” but no good searches came up that I found.
It is function annotation for a return type.
annotations do nothing inside the code, they are there to help a user with code completion (in my experience).
Here is the PEP for it.
Let me demonstrate, what I mean by “annotations do nothing inside the code”. Here is an example:
def fun(a: str, b: int) -> str: return 1 if __name__ == '__main__': print(fun(10, 10))
The above code will run without any errors. but as you can see the first parameter should be a
string, and the second an
int. But, this only is a problem in my IDE, the code runs just fine:
They’re function annotations. They don’t really do anything by themselves, but they can be used for documentation or in combination with metaprogramming.