validate password - change form.py

from django.contrib.auth.forms import UserCreationForm
from django.core.exceptions import ValidationError
from django.utils.translation import gettext_lazy as _
from django.contrib.auth import get_user_model

UserModel = get_user_model()

class MyHolidayUserCreationForm(UserCreationForm):
    user = None

    def clean_password1(self):
        password1 = self.cleaned_data.get("password1")
        self.validate_password(password1)
        return password1

    def validate_password(self, password):
        if len(password) < 6:
            raise ValidationError(_("Password must be at least 6 characters long."))

        has_letter = False
        has_digit = False
        has_underscore = False

        for char in password:
            if char.isalpha():
                has_letter = True
            elif char.isdigit():
                has_digit = True
            elif char == '_':
                has_underscore = True

        if not has_letter:
            raise ValidationError(_("Password must contain at least one letter."))

        if not has_digit:
            raise ValidationError(_("Password must contain at least one digit."))

        if not has_underscore:
            raise ValidationError(_("Password must contain at least one underscore."))

    class Meta(UserCreationForm.Meta):
        model = UserModel
        fields = ('email',)