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"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 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 as x:
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 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)
if __name__ == '__main__':
unittest.main()
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