How can I check if a type is a subtype of a type in Python?

Question

How can I check if a type is a subtype of a type in Python?

python

Solution

Maybe `issubclass`?

>>> class A(object): pass
>>> class B(A): pass
>>> class C(object): pass
>>> issubclass(A, A)
True
>>> issubclass(B, A)
True
>>> issubclass(C, A)
False

Problem

How can I check if a type is a subtype of a type in Python? I am not referring to instances of a type, but comparing type instances themselves. For example: ``` class A(object): ... class B(A): ... class C(object) ... # Check that instance is a subclass instance: isinstance(A(), A) --> True isinstance(B(), A) --> True isinstance(C(), A) --> False # What about comparing the types directly? SOME_FUNCTION(A, A) --> True SOME_FUNCTION(B, A) --> True SOME_FUNCTION(C, A) --> False ```

Original source

Accepted Answer

Maybe `issubclass`?

```
>>> class A(object): pass
>>> class B(A): pass
>>> class C(object): pass
>>> issubclass(A, A)
True
>>> issubclass(B, A)
True
>>> issubclass(C, A)
False
```