validate the number of numeric characters loaded python

Question

I've been trying to solve this simple puzzle for hours, I'm new to python and the idea with this function is to be able to validate that the input corresponds to a numerical value and that otherwise restart the system, I can't get the function to return the value as it should and That is why I ask for your collaboration, without further ado, thank you very much.

import json
def cantidad_alumnos_cargar():
  try:
    a = int(input("Cantidad de alumnos a cargar: "))
    return a
  except:
    print("pone numeros!")
    cantidad_alumnos_cargar()

print(cantidad_alumnos_cargar())

similiar to [asking-the-user-for-input-until-they-give-a-valid-response](https://stackoverflow.com/questions/23294658/asking-the-user-for-input-until-they-give-a-valid-response) — Lei Yang, Apr 13 '21 at 00:49
If i int first por example and "a", then return "none" Cantidad de alumnos a cargar: a pone numeros! Cantidad de alumnos a cargar: 2 None — santiago arriola, Apr 13 '21 at 00:54

score 0 · Answer 1 · edited Apr 13 '21 at 02:43

0

import json
def cantidad_alumnos_cargar():
    try:
        a = input(int("Cantidad de alumnos a cargar: "))
        return a
    except:
        print("pone numeros!")
        cantidad_alumnos_cargar()
    
    print(cantidad_alumnos_cargar())

You should be calling input() then int(), not int() then input().

edited Apr 13 '21 at 02:43

Jacob Lee

4,405
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answered Apr 13 '21 at 01:40

millah

3
2

Did you try running this code? Note how you are trying to pass a string which is not of an integer. This would immediately raise a `ValueError`, since any string passed to `int()` must be that of a base-10 integer. – Jacob Lee Apr 13 '21 at 02:44
recursive makes no sense here. – Lei Yang Apr 23 '21 at 05:47

validate the number of numeric characters loaded python

1 Answers1