I wanted to ask if I create a function and I want to make sure the argument passed to function is number. How to do that ? Also why does (-11).isdigit() returns False ?

Hi Swarntam! Thanks for reaching out. The problem is, when you put negative numbers such as -11, the isdigit() method counts the - sign as a string value and it rejects it. So, we can slice it from the number. Please, use the following syntax: str(-11)[1:].isdigit() Hope this helps. Best, Tsvetelin

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