old_contents: from django import forms
  from django.utils.translation import ugettext_lazy as _
  
  from models import Coupon
  from settings import COUPON_TYPES
  
  
  class CouponGenerationForm(forms.Form):
      quantity = forms.IntegerField(label=_("Quantity"))
      value = forms.IntegerField(label=_("Value"))
      type = forms.ChoiceField(label=_("Type"), choices=COUPON_TYPES)
  
  
  class CouponForm(forms.Form):
      code = forms.CharField(label=_("Coupon code"))
  
      def __init__(self, *args, **kwargs):
          self.user = None
          self.types = None
          if 'user' in kwargs:
              self.user = kwargs['user']
              del kwargs['user']
          if 'types' in kwargs:
              self.types = kwargs['types']
              del kwargs['types']
          return super(CouponForm, self).__init__(*args, **kwargs)
  
      def clean_code(self):
          code = self.cleaned_data['code']
          try:
              coupon = Coupon.objects.get(code=code)
          except Coupon.DoesNotExist:
              raise forms.ValidationError(_("This code is not valid."))
          self.coupon = coupon
          if not coupon.redeemed_at is None:
              raise forms.ValidationError(_("This code has already been used."))
          if not coupon.user is None and coupon.user != self.user:
              raise forms.ValidationError(_("This code is not valid for your account."))
          if not self.types is None and coupon.type not in self.types:
              raise forms.ValidationError(_("This code is not ment to be used here."))
          return code
  
  
new_contents: from django import forms
  from django.utils.translation import ugettext_lazy as _
  
  from models import Coupon
  from settings import COUPON_TYPES
  
  
  class CouponGenerationForm(forms.Form):
      quantity = forms.IntegerField(label=_("Quantity"))
      value = forms.IntegerField(label=_("Value"))
      type = forms.ChoiceField(label=_("Type"), choices=COUPON_TYPES)
  
  
  class CouponForm(forms.Form):
      code = forms.CharField(label=_("Coupon code"))
  
      def __init__(self, *args, **kwargs):
          self.user = None
          self.types = None
          if 'user' in kwargs:
              self.user = kwargs['user']
              del kwargs['user']
          if 'types' in kwargs:
              self.types = kwargs['types']
              del kwargs['types']
          return super(CouponForm, self).__init__(*args, **kwargs)
  
      def clean_code(self):
          code = self.cleaned_data['code']
          try:
              coupon = Coupon.objects.get(code=code)
          except Coupon.DoesNotExist:
              raise forms.ValidationError(_("This code is not valid."))
          self.coupon = coupon
          if not coupon.redeemed_at is None:
              raise forms.ValidationError(_("This code has already been used."))
          if not coupon.user is None and coupon.user != self.user:
              raise forms.ValidationError(_("This code is not valid for your account."))
          if not self.types is None and coupon.type not in self.types:
              raise forms.ValidationError(_("This code is not ment to be used here."))
          return code
  
subject: remove empty line