[Python-Dev] Why wont duplicate methods be flagged as error (syntax or anything suitable error) (original) (raw)

Chris Angelico rosuav at gmail.com
Sun Jan 14 03:20:57 EST 2018

On Sun, Jan 14, 2018 at 7:10 PM, joannah nanjekye <nanjekyejoannah at gmail.com> wrote:

Hello,

Apparently when you implement two methods with the same name: def sub(x, y): print(x -y) def sub(x, y): print(x -y) Even with type hints. def sub(x: int, y:int) -> int: return x - y def sub(x: float, y:float) -> float: return 8 If you are from another background, you will expect the syntax with type hints to act as though method overloading but instead last implementation is always called. If this is the required behavior,then just flag any duplicate method implementations as syntax errors. Is this sort of method name duplication important in any cases? Not aimed at criticism, just to understand.

This is not an error in the language for the same reason that any other assignment isn't an error:

x = 5 x = 6

But you will find that a number of linters will flag this as a warning. You can configure your editor to constantly run a linter and show you when something's wrong.

ChrisA

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