"Test the functionality of Python classes implementing operators." import unittest testmeths = [ # Binary operations "add", "radd", "sub", "rsub", "mul", "rmul", "matmul", "rmatmul", "truediv", "rtruediv", "floordiv", "rfloordiv", "mod", "rmod", "divmod", "rdivmod", "pow", "rpow", "rshift", "rrshift", "lshift", "rlshift", "and", "rand", "or", "ror", "xor", "rxor", # List/dict operations "contains", "getitem", "setitem", "delitem", # Unary operations "neg", "pos", "abs", # generic operations "init", ] # These need to return something other than None # "hash", # "str", # "repr", # "int", # "float", # These are separate because they can influence the test of other methods. # "getattr", # "setattr", # "delattr", callLst = [] def trackCall(f): def track(*args, **kwargs): callLst.append((f.__name__, args)) return f(*args, **kwargs) return track statictests = """ @trackCall def __hash__(self, *args): return hash(id(self)) @trackCall def __str__(self, *args): return "AllTests" @trackCall def __repr__(self, *args): return "AllTests" @trackCall def __int__(self, *args): return 1 @trackCall def __index__(self, *args): return 1 @trackCall def __float__(self, *args): return 1.0 @trackCall def __eq__(self, *args): return True @trackCall def __ne__(self, *args): return False @trackCall def __lt__(self, *args): return False @trackCall def __le__(self, *args): return True @trackCall def __gt__(self, *args): return False @trackCall def __ge__(self, *args): return True """ # Synthesize all the other AllTests methods from the names in testmeths. method_template = """\ @trackCall def __%s__(self, *args): pass """ d = {} exec(statictests, globals(), d) for method in testmeths: exec(method_template % method, globals(), d) AllTests = type("AllTests", (object,), d) del d, statictests, method, method_template class ClassTests(unittest.TestCase): def setUp(self): callLst[:] = [] def assertCallStack(self, expected_calls): actualCallList = callLst[:] # need to copy because the comparison below will add # additional calls to callLst if expected_calls != actualCallList: self.fail("Expected call list:\n %s\ndoes not match actual call list\n %s" % (expected_calls, actualCallList)) def testInit(self): foo = AllTests() self.assertCallStack([("__init__", (foo,))]) def testBinaryOps(self): testme = AllTests() # Binary operations callLst[:] = [] testme + 1 self.assertCallStack([("__add__", (testme, 1))]) callLst[:] = [] 1 + testme self.assertCallStack([("__radd__", (testme, 1))]) callLst[:] = [] testme - 1 self.assertCallStack([("__sub__", (testme, 1))]) callLst[:] = [] 1 - testme self.assertCallStack([("__rsub__", (testme, 1))]) callLst[:] = [] testme * 1 self.assertCallStack([("__mul__", (testme, 1))]) callLst[:] = [] 1 * testme self.assertCallStack([("__rmul__", (testme, 1))]) callLst[:] = [] testme @ 1 self.assertCallStack([("__matmul__", (testme, 1))]) callLst[:] = [] 1 @ testme self.assertCallStack([("__rmatmul__", (testme, 1))]) callLst[:] = [] testme / 1 self.assertCallStack([("__truediv__", (testme, 1))]) callLst[:] = [] 1 / testme self.assertCallStack([("__rtruediv__", (testme, 1))]) callLst[:] = [] testme // 1 self.assertCallStack([("__floordiv__", (testme, 1))]) callLst[:] = [] 1 // testme self.assertCallStack([("__rfloordiv__", (testme, 1))]) callLst[:] = [] testme % 1 self.assertCallStack([("__mod__", (testme, 1))]) callLst[:] = [] 1 % testme self.assertCallStack([("__rmod__", (testme, 1))]) callLst[:] = [] divmod(testme,1) self.assertCallStack([("__divmod__", (testme, 1))]) callLst[:] = [] divmod(1, testme) self.assertCallStack([("__rdivmod__", (testme, 1))]) callLst[:] = [] testme ** 1 self.assertCallStack([("__pow__", (testme, 1))]) callLst[:] = [] 1 ** testme self.assertCallStack([("__rpow__", (testme, 1))]) callLst[:] = [] testme >> 1 self.assertCallStack([("__rshift__", (testme, 1))]) callLst[:] = [] 1 >> testme self.assertCallStack([("__rrshift__", (testme, 1))]) callLst[:] = [] testme << 1 self.assertCallStack([("__lshift__", (testme, 1))]) callLst[:] = [] 1 << testme self.assertCallStack([("__rlshift__", (testme, 1))]) callLst[:] = [] testme & 1 self.assertCallStack([("__and__", (testme, 1))]) callLst[:] = [] 1 & testme self.assertCallStack([("__rand__", (testme, 1))]) callLst[:] = [] testme | 1 self.assertCallStack([("__or__", (testme, 1))]) callLst[:] = [] 1 | testme self.assertCallStack([("__ror__", (testme, 1))]) callLst[:] = [] testme ^ 1 self.assertCallStack([("__xor__", (testme, 1))]) callLst[:] = [] 1 ^ testme self.assertCallStack([("__rxor__", (testme, 1))]) def testListAndDictOps(self): testme = AllTests() # List/dict operations class Empty: pass try: 1 in Empty() self.fail('failed, should have raised TypeError') except TypeError: pass callLst[:] = [] 1 in testme self.assertCallStack([('__contains__', (testme, 1))]) callLst[:] = [] testme[1] self.assertCallStack([('__getitem__', (testme, 1))]) callLst[:] = [] testme[1] = 1 self.assertCallStack([('__setitem__', (testme, 1, 1))]) callLst[:] = [] del testme[1] self.assertCallStack([('__delitem__', (testme, 1))]) callLst[:] = [] testme[:42] self.assertCallStack([('__getitem__', (testme, slice(None, 42)))]) callLst[:] = [] testme[:42] = "The Answer" self.assertCallStack([('__setitem__', (testme, slice(None, 42), "The Answer"))]) callLst[:] = [] del testme[:42] self.assertCallStack([('__delitem__', (testme, slice(None, 42)))]) callLst[:] = [] testme[2:1024:10] self.assertCallStack([('__getitem__', (testme, slice(2, 1024, 10)))]) callLst[:] = [] testme[2:1024:10] = "A lot" self.assertCallStack([('__setitem__', (testme, slice(2, 1024, 10), "A lot"))]) callLst[:] = [] del testme[2:1024:10] self.assertCallStack([('__delitem__', (testme, slice(2, 1024, 10)))]) callLst[:] = [] testme[:42, ..., :24:, 24, 100] self.assertCallStack([('__getitem__', (testme, (slice(None, 42, None), Ellipsis, slice(None, 24, None), 24, 100)))]) callLst[:] = [] testme[:42, ..., :24:, 24, 100] = "Strange" self.assertCallStack([('__setitem__', (testme, (slice(None, 42, None), Ellipsis, slice(None, 24, None), 24, 100), "Strange"))]) callLst[:] = [] del testme[:42, ..., :24:, 24, 100] self.assertCallStack([('__delitem__', (testme, (slice(None, 42, None), Ellipsis, slice(None, 24, None), 24, 100)))]) def testUnaryOps(self): testme = AllTests() callLst[:] = [] -testme self.assertCallStack([('__neg__', (testme,))]) callLst[:] = [] +testme self.assertCallStack([('__pos__', (testme,))]) callLst[:] = [] abs(testme) self.assertCallStack([('__abs__', (testme,))]) callLst[:] = [] int(testme) self.assertCallStack([('__int__', (testme,))]) callLst[:] = [] float(testme) self.assertCallStack([('__float__', (testme,))]) callLst[:] = [] oct(testme) self.assertCallStack([('__index__', (testme,))]) callLst[:] = [] hex(testme) self.assertCallStack([('__index__', (testme,))]) def testMisc(self): testme = AllTests() callLst[:] = [] hash(testme) self.assertCallStack([('__hash__', (testme,))]) callLst[:] = [] repr(testme) self.assertCallStack([('__repr__', (testme,))]) callLst[:] = [] str(testme) self.assertCallStack([('__str__', (testme,))]) callLst[:] = [] testme == 1 self.assertCallStack([('__eq__', (testme, 1))]) callLst[:] = [] testme < 1 self.assertCallStack([('__lt__', (testme, 1))]) callLst[:] = [] testme > 1 self.assertCallStack([('__gt__', (testme, 1))]) callLst[:] = [] testme != 1 self.assertCallStack([('__ne__', (testme, 1))]) callLst[:] = [] 1 == testme self.assertCallStack([('__eq__', (1, testme))]) callLst[:] = [] 1 < testme self.assertCallStack([('__gt__', (1, testme))]) callLst[:] = [] 1 > testme self.assertCallStack([('__lt__', (1, testme))]) callLst[:] = [] 1 != testme self.assertCallStack([('__ne__', (1, testme))]) def testGetSetAndDel(self): # Interfering tests class ExtraTests(AllTests): @trackCall def __getattr__(self, *args): return "SomeVal" @trackCall def __setattr__(self, *args): pass @trackCall def __delattr__(self, *args): pass testme = ExtraTests() callLst[:] = [] testme.spam self.assertCallStack([('__getattr__', (testme, "spam"))]) callLst[:] = [] testme.eggs = "spam, spam, spam and ham" self.assertCallStack([('__setattr__', (testme, "eggs", "spam, spam, spam and ham"))]) callLst[:] = [] del testme.cardinal self.assertCallStack([('__delattr__', (testme, "cardinal"))]) def testHasAttrString(self): import sys from test.support import import_helper _testcapi = import_helper.import_module('_testcapi') class A: def __init__(self): self.attr = 1 a = A() self.assertEqual(_testcapi.object_hasattrstring(a, b"attr"), 1) self.assertEqual(_testcapi.object_hasattrstring(a, b"noattr"), 0) self.assertIsNone(sys.exception()) def testDel(self): x = [] class DelTest: def __del__(self): x.append("crab people, crab people") testme = DelTest() del testme import gc gc.collect() self.assertEqual(["crab people, crab people"], x) def testBadTypeReturned(self): # return values of some method are type-checked class BadTypeClass: def __int__(self): return None __float__ = __int__ __complex__ = __int__ __str__ = __int__ __repr__ = __int__ __bytes__ = __int__ __bool__ = __int__ __index__ = __int__ def index(x): return [][x] for f in [float, complex, str, repr, bytes, bin, oct, hex, bool, index]: self.assertRaises(TypeError, f, BadTypeClass()) def testHashStuff(self): # Test correct errors from hash() on objects with comparisons but # no __hash__ class C0: pass hash(C0()) # This should work; the next two should raise TypeError class C2: def __eq__(self, other): return 1 self.assertRaises(TypeError, hash, C2()) def testSFBug532646(self): # Test for SF bug 532646 class A: pass A.__call__ = A() a = A() try: a() # This should not segfault except RecursionError: pass else: self.fail("Failed to raise RecursionError") def testForExceptionsRaisedInInstanceGetattr2(self): # Tests for exceptions raised in instance_getattr2(). def booh(self): raise AttributeError("booh") class A: a = property(booh) try: A().a # Raised AttributeError: A instance has no attribute 'a' except AttributeError as x: if str(x) != "booh": self.fail("attribute error for A().a got masked: %s" % x) class E: __eq__ = property(booh) E() == E() # In debug mode, caused a C-level assert() to fail class I: __init__ = property(booh) try: # In debug mode, printed XXX undetected error and # raises AttributeError I() except AttributeError: pass else: self.fail("attribute error for I.__init__ got masked") def assertNotOrderable(self, a, b): with self.assertRaises(TypeError): a < b with self.assertRaises(TypeError): a > b with self.assertRaises(TypeError): a <= b with self.assertRaises(TypeError): a >= b def testHashComparisonOfMethods(self): # Test comparison and hash of methods class A: def __init__(self, x): self.x = x def f(self): pass def g(self): pass def __eq__(self, other): return True def __hash__(self): raise TypeError class B(A): pass a1 = A(1) a2 = A(1) self.assertTrue(a1.f == a1.f) self.assertFalse(a1.f != a1.f) self.assertFalse(a1.f == a2.f) self.assertTrue(a1.f != a2.f) self.assertFalse(a1.f == a1.g) self.assertTrue(a1.f != a1.g) self.assertNotOrderable(a1.f, a1.f) self.assertEqual(hash(a1.f), hash(a1.f)) self.assertFalse(A.f == a1.f) self.assertTrue(A.f != a1.f) self.assertFalse(A.f == A.g) self.assertTrue(A.f != A.g) self.assertTrue(B.f == A.f) self.assertFalse(B.f != A.f) self.assertNotOrderable(A.f, A.f) self.assertEqual(hash(B.f), hash(A.f)) # the following triggers a SystemError in 2.4 a = A(hash(A.f)^(-1)) hash(a.f) def testSetattrWrapperNameIntern(self): # Issue #25794: __setattr__ should intern the attribute name class A: pass def add(self, other): return 'summa' name = str(b'__add__', 'ascii') # shouldn't be optimized self.assertIsNot(name, '__add__') # not interned type.__setattr__(A, name, add) self.assertEqual(A() + 1, 'summa') name2 = str(b'__add__', 'ascii') self.assertIsNot(name2, '__add__') self.assertIsNot(name2, name) type.__delattr__(A, name2) with self.assertRaises(TypeError): A() + 1 def testSetattrNonStringName(self): class A: pass with self.assertRaises(TypeError): type.__setattr__(A, b'x', None) def testTypeAttributeAccessErrorMessages(self): class A: pass error_msg = "type object 'A' has no attribute 'x'" with self.assertRaisesRegex(AttributeError, error_msg): A.x with self.assertRaisesRegex(AttributeError, error_msg): del A.x def testObjectAttributeAccessErrorMessages(self): class A: pass class B: y = 0 __slots__ = ('z',) class C: __slots__ = ("y",) def __setattr__(self, name, value) -> None: if name == "z": super().__setattr__("y", 1) else: super().__setattr__(name, value) error_msg = "'A' object has no attribute 'x'" with self.assertRaisesRegex(AttributeError, error_msg): A().x with self.assertRaisesRegex(AttributeError, error_msg): del A().x error_msg = "'B' object has no attribute 'x'" with self.assertRaisesRegex(AttributeError, error_msg): B().x with self.assertRaisesRegex(AttributeError, error_msg): del B().x with self.assertRaisesRegex( AttributeError, "'B' object has no attribute 'x' and no __dict__ for setting new attributes" ): B().x = 0 with self.assertRaisesRegex( AttributeError, "'C' object has no attribute 'x'" ): C().x = 0 error_msg = "'B' object attribute 'y' is read-only" with self.assertRaisesRegex(AttributeError, error_msg): del B().y with self.assertRaisesRegex(AttributeError, error_msg): B().y = 0 error_msg = 'z' with self.assertRaisesRegex(AttributeError, error_msg): B().z with self.assertRaisesRegex(AttributeError, error_msg): del B().z def testConstructorErrorMessages(self): # bpo-31506: Improves the error message logic for object_new & object_init # Class without any method overrides class C: pass error_msg = r'C.__init__\(\) takes exactly one argument \(the instance to initialize\)' with self.assertRaisesRegex(TypeError, r'C\(\) takes no arguments'): C(42) with self.assertRaisesRegex(TypeError, r'C\(\) takes no arguments'): C.__new__(C, 42) with self.assertRaisesRegex(TypeError, error_msg): C().__init__(42) with self.assertRaisesRegex(TypeError, r'C\(\) takes no arguments'): object.__new__(C, 42) with self.assertRaisesRegex(TypeError, error_msg): object.__init__(C(), 42) # Class with both `__init__` & `__new__` method overridden class D: def __new__(cls, *args, **kwargs): super().__new__(cls, *args, **kwargs) def __init__(self, *args, **kwargs): super().__init__(*args, **kwargs) error_msg = r'object.__new__\(\) takes exactly one argument \(the type to instantiate\)' with self.assertRaisesRegex(TypeError, error_msg): D(42) with self.assertRaisesRegex(TypeError, error_msg): D.__new__(D, 42) with self.assertRaisesRegex(TypeError, error_msg): object.__new__(D, 42) # Class that only overrides __init__ class E: def __init__(self, *args, **kwargs): super().__init__(*args, **kwargs) error_msg = r'object.__init__\(\) takes exactly one argument \(the instance to initialize\)' with self.assertRaisesRegex(TypeError, error_msg): E().__init__(42) with self.assertRaisesRegex(TypeError, error_msg): object.__init__(E(), 42) def testClassWithExtCall(self): class Meta(int): def __init__(*args, **kwargs): pass def __new__(cls, name, bases, attrs, **kwargs): return bases, kwargs d = {'metaclass': Meta} class A(**d): pass self.assertEqual(A, ((), {})) class A(0, 1, 2, 3, 4, 5, 6, 7, **d): pass self.assertEqual(A, (tuple(range(8)), {})) class A(0, *range(1, 8), **d, foo='bar'): pass self.assertEqual(A, (tuple(range(8)), {'foo': 'bar'})) def testClassCallRecursionLimit(self): class C: def __init__(self): self.c = C() with self.assertRaises(RecursionError): C() def add_one_level(): #Each call to C() consumes 2 levels, so offset by 1. C() with self.assertRaises(RecursionError): add_one_level() def testMetaclassCallOptimization(self): calls = 0 class TypeMetaclass(type): def __call__(cls, *args, **kwargs): nonlocal calls calls += 1 return type.__call__(cls, *args, **kwargs) class Type(metaclass=TypeMetaclass): def __init__(self, obj): self._obj = obj for i in range(100): Type(i) self.assertEqual(calls, 100) if __name__ == '__main__': unittest.main()