Python why does issubclass(int, float) return False

Question

In Python, why do both issubclass(int, float) and isinstance(1, float) return False?

I always thought that int is a subclass of float.

In [1]: issubclass(int, float)
Out[1]: False

In [2]: isinstance(1, float)
Out[2]: False

---

Research

https://github.com/Stewori/pytypes/issues/26

Mentions [The numeric tower][1] from PEP 484, but I think that's for type hints.

Answer 1

Because int is not a subclass of float:

>>> import inspect
>>> inspect.getmro(int)
(<class 'int'>, <class 'object'>)
>>> inspect.getmro(float)
(<class 'float'>, <class 'object'>)