django - Avoiding existence errors - 


def clean_bank_account(self):     import ipdb; ipdb.set_trace()     ssn = self.form.cleaned_data.get('ssn')     customer = customerprofile.objects.filter(ssn=ssn)      bank_account = self.form.cleaned_data.get('bank_account')     bank = self.form.cleaned_data.get('bank')     bank_transit = self.form.cleaned_data.get('bank_transit')     qs = financialprofile.objects.filter(         bank=bank,         bank_transit=bank_transit,         bank_account=bank_account)      if customer.count() == 1:         cust in customer:             qs = qs.exclude(customer_id=cust.id)     if qs.count() > 0:         # concatenation of bank transit, bank account , bank         # number must unique. hence, following message         # displayed if in use.         raise validationerror(             _('the bank, bank transit , bank in use.')         )      if bank not in (none, ''):             # check bank account format specific banks             length = settings.loanwolf_bank_accounts_length.get(bank)             if length:                 if bank_transit not in (none, ''):                     if not bank_account.isnumeric() or length != len(bank_account):                         raise validationerror(                             _('bank account number must contain %d digits') % length  # noqa                         )                 else:                     raise validationerror(                         _('cannot validate bank account without valid bank transit')  # noqa                     )     return bank_account

i improve structure of code. can't customerprofile.objects.get(ssn=ssn), because give me error if object doesn't exist. instead decided create list filter returns me queryset. lines 

if customer.count() == 1:         cust in customer:             qs = qs.exclude(customer_id=cust.id)

will exclude customer id if there exists 1 customer in list. @ beginning, thought remove loop , using customer, can't since queryset. tought there way improve part of code?

the loop can replaced in filter

 qs = qs.exclude(customer_id__in=[cust.id cust in customer])

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