Showing content from http://svn.python.org/projects/python/branches/test_subprocess_10826/Lib/test/test_typechecks.py below:
"""Unit tests for __instancecheck__ and __subclasscheck__.""" import unittest from test import support 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) def test_main(): support.run_unittest(TypeChecksTest) if __name__ == "__main__": unittest.main()
RetroSearch is an open source project built by @garambo
| Open a GitHub Issue
Search and Browse the WWW like it's 1997 | Search results from DuckDuckGo
HTML:
3.2
| Encoding:
UTF-8
| Version:
0.7.4