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

[Fredrik Lundh]

Grant Edwards wrote:

> > So? the isdigit method tests whether all characters are digits.
> >
> >>>> '15'.isdigit()
> > True
>
> But that is "obviously" wrong, since '15' is not a digit.

no, but all characters in the string belongs to the "digit" character
class, which is what the "is" predicates look for.

cf.

>>> "\t".isspace()
True
>>> "Life of Brian".istitle()
False
>>> u"\N{GREEK CAPITAL LETTER BETA}".isalpha()
True

and so on.

</F>