[Python] Permission matching query does not exist in custom permission

try:
user = User.objects.get(username = 'xyz')
custom_permission = Permission.objects.get(codename='is_custom')
user.user_permissions.add(custom_permission)
user.save()
print user.has_perm("is_custom")
print user.has_perm('app.is_custom')
user.get_all_permissions()

except Exception as e:
print(">>>>>",e)


I have done this simple thing to check the user custom permission but it rises the exception

DoesNotExist('Permission matching query does not exist.')

what's wrong in this ??

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