website/webpage/forms.py

from re import Pattern
from django import forms
from django.core.exceptions import ValidationError
from django.utils.translation import gettext_lazy as txt

class SignbookForm(forms.Form): 
    name = forms.CharField(label="Name")
    website = forms.CharField(label="Website", required=False)
    email = forms.EmailField(label="Email", required=False)
    comment = forms.CharField(label="Comment", required=False)
    capcha = forms.CharField(label="Tell me that you love 'me'")

    def validate_capcha(self):
      if self.cleaned_data["capcha"].lower() != "i love me":
        raise ValidationError(txt('Invalid captcha'), code="invalid")
      return self