How to prevent entering negative numbers in Kivymd MDTextField

Question

In MDTextField, there is a restriction on entering only numbers, this is input_filter: "float", "int". But you can enter negative numbers

MDTextField:
    id: z1_m
    text:""
    hint_text: "z1"
    helper_text: "Число зубьев шестерни"                        
    helper_text_mode: "on_focus"
    input_filter: "float"                                               
    on_text_validate: app.prochnjst()

Expected that when the user enters a minus sign, nothing happens

Does this answer your question? [Reject Negative Numbers as exceptions in Python](https://stackoverflow.com/questions/34244588/reject-negative-numbers-as-exceptions-in-python) — Luuk, Jan 21 '23 at 12:43

Talha Tayyab · Accepted Answer · 2023-01-21T13:06:24.517

0

You can use try/ except:

try: 
  x = int(input())
  assert x > 0 
except AssertionError :
  print("Only positives are allowed")

edited Jan 21 '23 at 13:06

answered Jan 21 '23 at 12:57

Talha Tayyab

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Please tell me where should I add this exception to the code. – Edem Jan 21 '23 at 13:14

How to prevent entering negative numbers in Kivymd MDTextField

1 Answers1