How do I check (at runtime) if one class is a subclass of another?


Let"s say that I have a class Suit and four subclasses of suit: Heart, Spade, Diamond, Club.

class Suit:
class Heart(Suit):
class Spade(Suit):
class Diamond(Suit):
class Club(Suit):

I have a method which receives a suit as a parameter, which is a class object, not an instance. More precisely, it may receive only one of the four values: Heart, Spade, Diamond, Club. How can I make an assertion which ensures such a thing? Something like:

def my_method(suit):
   assert(suit subclass of Suit)

I"m using Python 3.

Answer rating: 261

You can use issubclass() like this assert issubclass(suit, Suit).

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