I want to check if the input is str or is int & if it's str repeat the loop

[DeaD_EyE]

Make a function to ask for integers, floats, etc...

from functools import partial


def ask(question, dtype=str, error_msg=None):
    while True:
        user_input = input(question)
        try:
            value = dtype(user_input)
        except ValueError:
            if error_msg:
                print(error_msg)
        else:
            return value


ask_int = partial(ask, dtype=int, error_msg="Please enter a valid integer.")
ask_float = partial(ask, dtype=float, error_msg="Please enter a valid float.")
ask_complex = partial(ask, dtype=complex, error_msg="Please enter a valid complex")

ask_int("How old are you? ")

Output:
In [26]: ask_int("How old are you? ")
How old are you? 128
Out[26]: 128

In [27]: ask_int("How old are you? ")
How old are you? 12.5
Please enter a valid integer.
How old are you? aaaaaa
Please enter a valid integer.

Just try following in the repl:

int("AAA")

You'll get a:

Error:
In [28]: int("AAA")
---------------------------------------------------------------------------
ValueError                                Traceback (most recent call last)
<ipython-input-28-ac34db391e65> in <module>
----> 1 int("AAA")

ValueError: invalid literal for int() with base 10: 'AAA'

An illegal value for int raises the ValueError.
You can catch this Exception and continue.

try:
    value = int(input("Value: "))
except ValueError:
    print("Wrong value")
else:
    # all fine, no exception at all
    print(value)

Finally, I put this block in a while-True loop and the while-True loop in a function.
The else-block returns the value. In the case a ValueError happens, the else-block is not executed.
The function will not return the value and ask the user again for input.