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def my_function(my_var: str) -> str: return 2 * my_var
Even if we give an hint to Python that the function is expected to return a string with -> str , it doesn't mean that the function has to return a string. In this case, if an integer is passed to the function as an argument, the function will return another integer without exceptions. (python.org/dev/peps/pep-0484)
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