Python: how do I use isnumeric()

Can someone kindly explain why the following throws an exception? And what should I do with variable s to find out whether it contains a number?

s = str(10)
if s.isnumeric():
    print s

When I read Python documentation it seems to me the above should work. See:

https://docs.python.org/3/library/stdtypes.html?highlight=isnumeric#str.isnumeric

But what I get is:

"AttributeError: 'str' object has no attribute 'isnumeric'"

Any help is most appreciated.

Thank you!

Answer

replace isnumeric() with isdigit() as

s = str(10)
if s.isdigit():
    print s