mirror of https://github.com/python/cpython
72 lines
2.6 KiB
Python
72 lines
2.6 KiB
Python
"""Unit tests for __instancecheck__ and __subclasscheck__."""
|
|
|
|
import unittest
|
|
|
|
|
|
class ABC(type):
|
|
|
|
def __instancecheck__(cls, inst):
|
|
"""Implement isinstance(inst, cls)."""
|
|
return any(cls.__subclasscheck__(c)
|
|
for c in {type(inst), inst.__class__})
|
|
|
|
def __subclasscheck__(cls, sub):
|
|
"""Implement issubclass(sub, cls)."""
|
|
candidates = cls.__dict__.get("__subclass__", set()) | {cls}
|
|
return any(c in candidates for c in sub.mro())
|
|
|
|
|
|
class Integer(metaclass=ABC):
|
|
__subclass__ = {int}
|
|
|
|
|
|
class SubInt(Integer):
|
|
pass
|
|
|
|
|
|
class TypeChecksTest(unittest.TestCase):
|
|
|
|
def testIsSubclassInternal(self):
|
|
self.assertEqual(Integer.__subclasscheck__(int), True)
|
|
self.assertEqual(Integer.__subclasscheck__(float), False)
|
|
|
|
def testIsSubclassBuiltin(self):
|
|
self.assertEqual(issubclass(int, Integer), True)
|
|
self.assertEqual(issubclass(int, (Integer,)), True)
|
|
self.assertEqual(issubclass(float, Integer), False)
|
|
self.assertEqual(issubclass(float, (Integer,)), False)
|
|
|
|
def testIsInstanceBuiltin(self):
|
|
self.assertEqual(isinstance(42, Integer), True)
|
|
self.assertEqual(isinstance(42, (Integer,)), True)
|
|
self.assertEqual(isinstance(3.14, Integer), False)
|
|
self.assertEqual(isinstance(3.14, (Integer,)), False)
|
|
|
|
def testIsInstanceActual(self):
|
|
self.assertEqual(isinstance(Integer(), Integer), True)
|
|
self.assertEqual(isinstance(Integer(), (Integer,)), True)
|
|
|
|
def testIsSubclassActual(self):
|
|
self.assertEqual(issubclass(Integer, Integer), True)
|
|
self.assertEqual(issubclass(Integer, (Integer,)), True)
|
|
|
|
def testSubclassBehavior(self):
|
|
self.assertEqual(issubclass(SubInt, Integer), True)
|
|
self.assertEqual(issubclass(SubInt, (Integer,)), True)
|
|
self.assertEqual(issubclass(SubInt, SubInt), True)
|
|
self.assertEqual(issubclass(SubInt, (SubInt,)), True)
|
|
self.assertEqual(issubclass(Integer, SubInt), False)
|
|
self.assertEqual(issubclass(Integer, (SubInt,)), False)
|
|
self.assertEqual(issubclass(int, SubInt), False)
|
|
self.assertEqual(issubclass(int, (SubInt,)), False)
|
|
self.assertEqual(isinstance(SubInt(), Integer), True)
|
|
self.assertEqual(isinstance(SubInt(), (Integer,)), True)
|
|
self.assertEqual(isinstance(SubInt(), SubInt), True)
|
|
self.assertEqual(isinstance(SubInt(), (SubInt,)), True)
|
|
self.assertEqual(isinstance(42, SubInt), False)
|
|
self.assertEqual(isinstance(42, (SubInt,)), False)
|
|
|
|
|
|
if __name__ == "__main__":
|
|
unittest.main()
|