checking if there are numbers in the string

[snippsat]

i tried x.digit(), and that worked as well.

The name is not important "rubberduck" is now temporarily assigning to each element in string flyTo.

>>> flyTo = 'yes9'
>>> any(rubberduck.isdigit() for rubberduck in flyTo)
True

When say "not important" so is c much better than rubberduck when iterate over characters.
To see each value can use list comprehension.

>>> flyTo = 'yes9'
>>> [rubberduck.isdigit() for rubberduck in flyTo]
[False, False, False, True]

Interactive shell can give info about a lot of stuff.

>>> help(any)
Help on built-in function any in module builtins:

any(...)
    any(iterable) -> bool
    
    Return True if bool(x) is True for any x in the iterable.
    If the iterable is empty, return False.

>>> flyTo = 'yes9'
>>> help(flyTo.isdigit)
Help on built-in function isdigit:

isdigit(...) method of builtins.str instance
    S.isdigit() -> bool
    
    Return True if all characters in S are digits
    and there is at least one character in S, False otherwise.