Python: if more than one of three things is true, return false

Question

I\'m writing a django model that allows my site to have coupons.

Coupons can have three types: lifetime account voucher, certain period of months voucher, certain numb

Answer 1

How about

if len(filter([self.months, self.dollars, self.lifetime])) > 1:
...

I find it just as readable as a list comprehension with an if clause, and more concise.