I need help limiting the amount of characters in python kivy

Question

I’m with a small amount, I’m trying to limit the amount of characters that can be typed without text, for example, a DDD code, where it only takes 2 or 3 digits, limit to only a maximum of 3 numbers, but I’m not getting, I tried to accomplish from the second, but it didn’t work either, the idea was now to limit by the kivy script itself, thanks even more personal: D

Kivy code Textinput:

    id: dd
    pos_hint:{"center_x":.35, "center_y":.2}
    size_hint:(.1,.05)
    multiline:False
    write_tab: False
    input_filter:'int'

Code python dd = self.root.ids.dd.text

dd = maxlength (2)

Answer 1

The guy string is iterable in Python and allows you to access its content via Slices. For example, texto[1:5] would return from the first to the fourth character of texto.

>>> print('anderson'[1:5])
nder

If you omit the first value, Python will understand that it is zero, starting from the beginning of the text:

>>> print('anderson'[:5])
ander

Already, if the value reported after the two points exceeds the text size, it will be returned only until the end of the same:

>>> print('anderson'[1:30])
nderson

Thus, to limit a text to a number N character, just do texto[:N].

Additional reading:

• "[-4:]" What is this syntax?
• Limiting the number of characters in a Python string

OBS:

In your case I think the code you want would be +- like this :

n = input("Digite o numero com DDD: (sem caracteres especial)")

-Input: 0011111111

print ('DDD:',n[:2])

-Output: DDD: 00

print ('numero:',n[2:])

-Exit: number: 11111111

recommend making a regex or a mask in your input so there is no risk of the user typing wrong