How to check if a string "is" an int?

[Grant Edwards]

On 2005-12-21, Antoon Pardon <apardon at forel.vub.ac.be> wrote:

>> 15 is not a digit. 1 is a digit. 5 is a digit. Putting them together to
>> make 15 is not a digit.
>
> So? the isdigit method tests whether all characters are digits.
>
>>>> '15'.isdigit()
> True

But that is "obviously" wrong, since '15' is not a digit.

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