How to do data type checking?

Question

Python

I have an input and it should only receive int data type. If you entered not int, then he should ask you to enter int data.

Answer 1

int - 4 bytes, positive value. If stupid, then (<=0 and lenght(input operand) > 4), where lenght is the byte count function.

Answer 2

isdigit()

int(input())

Answer 3

You invited me as a tag expert (which is strange, not my area)
But I know the answer: the validator depends on your library or framework.
For Flask: flask.pocoo.org/docs/1.0/patterns/wtforms
For Django: https://docs.djangoproject.com/en/2.2/ref/forms/va...