Whether to enter somewhere the maximum and minimum length of the password?

Question

Passwords

Hello, I am currently writing a serializer that uses a password field. Actually, this is a field I wrote, inherited from CharField.
In the constructor, before calling the parent's __init__ method, I added the following line:

kwargs['max_length'], kwargs['min_length'] = 127, 8

So the question is: is it necessary to put these numbers somewhere? I mean some settings maybe? Or hardcode right here?