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from pypy.module.__builtin__.abstractinst import *
class TestAbstractInst:
def test_abstract_isclass(self):
space = self.space
w_B1, w_B2, w_B3, w_X, w_Y = space.fixedview(space.appexec([], """():
class X(object): pass
class Y: pass
B1, B2, B3 = X(), X(), X()
B2.__bases__ = (42,)
B3.__bases__ = 'spam'
return B1, B2, B3, X, Y
"""))
assert abstract_isclass_w(space, space.w_int) is True
assert abstract_isclass_w(space, w_B1) is False
assert abstract_isclass_w(space, w_B2) is True
assert abstract_isclass_w(space, w_B3) is False
assert abstract_isclass_w(space, w_X) is True
assert abstract_isclass_w(space, w_Y) is True
def test_abstract_getclass(self):
space = self.space
w_x, w_y, w_A, w_MyInst = space.fixedview(space.appexec([], """():
class MyInst(object):
def __init__(self, myclass):
self.myclass = myclass
def __class__(self):
if self.myclass is None:
raise AttributeError
return self.myclass
__class__ = property(__class__)
A = object()
x = MyInst(A)
y = MyInst(None)
return x, y, A, MyInst
"""))
w_42 = space.wrap(42)
assert space.is_w(abstract_getclass(space, w_42), space.w_int)
assert space.is_w(abstract_getclass(space, w_x), w_A)
assert space.is_w(abstract_getclass(space, w_y), w_MyInst)
assert space.is_w(abstract_getclass(space, w_MyInst), space.w_type)
class AppTestAbstractInst:
def test_abstract_isinstance(self):
class MyBaseInst(object):
pass
class MyInst(MyBaseInst):
def __init__(self, myclass):
self.myclass = myclass
def __class__(self):
if self.myclass is None:
raise AttributeError
return self.myclass
__class__ = property(__class__)
class MyInst2(MyBaseInst):
pass
class MyClass(object):
pass
A = MyClass()
x = MyInst(A)
assert x.__class__ is A
assert isinstance(x, MyInst)
assert isinstance(x, MyBaseInst)
assert not isinstance(x, MyInst2)
raises(TypeError, isinstance, x, A) # A has no __bases__
A.__bases__ = "hello world"
raises(TypeError, isinstance, x, A) # A.__bases__ is not tuple
class Foo(object):
pass
class SubFoo1(Foo):
pass
class SubFoo2(Foo):
pass
y = MyInst(SubFoo1)
assert isinstance(y, MyInst)
assert isinstance(y, MyBaseInst)
assert not isinstance(y, MyInst2)
assert isinstance(y, SubFoo1)
assert isinstance(y, Foo)
assert not isinstance(y, SubFoo2)
z = MyInst(None)
assert isinstance(z, MyInst)
assert isinstance(z, MyBaseInst)
assert not isinstance(z, MyInst2)
assert not isinstance(z, SubFoo1)
assert isinstance(y, ((), MyInst2, SubFoo1))
assert isinstance(y, (MyBaseInst, (SubFoo2,)))
assert not isinstance(y, (MyInst2, SubFoo2))
assert not isinstance(z, ())
class Foo(object):
pass
class Bar:
pass
u = MyInst(Foo)
assert isinstance(u, MyInst)
assert isinstance(u, MyBaseInst)
assert not isinstance(u, MyInst2)
assert isinstance(u, Foo)
assert not isinstance(u, Bar)
v = MyInst(Bar)
assert isinstance(v, MyInst)
assert isinstance(v, MyBaseInst)
assert not isinstance(v, MyInst2)
assert not isinstance(v, Foo)
assert isinstance(v, Bar)
BBase = MyClass()
BSub1 = MyClass()
BSub2 = MyClass()
BBase.__bases__ = ()
BSub1.__bases__ = (BBase,)
BSub2.__bases__ = (BBase,)
x = MyInst(BSub1)
assert isinstance(x, BSub1)
assert isinstance(x, BBase)
assert not isinstance(x, BSub2)
assert isinstance(x, (BSub2, (), (BSub1,)))
del BBase.__bases__
assert isinstance(x, BSub1)
raises(TypeError, isinstance, x, BBase)
assert not isinstance(x, BSub2)
BBase.__bases__ = "foobar"
assert isinstance(x, BSub1)
raises(TypeError, isinstance, x, BBase)
assert not isinstance(x, BSub2)
class BadClass:
@property
def __class__(self):
raise RuntimeError
raises(RuntimeError, isinstance, BadClass(), bool)
# test another code path
raises(RuntimeError, isinstance, BadClass(), Foo)
def test_abstract_issubclass(self):
class MyBaseInst(object):
pass
class MyInst(MyBaseInst):
pass
class MyInst2(MyBaseInst):
pass
class MyClass(object):
pass
assert issubclass(MyInst, MyBaseInst)
assert issubclass(MyInst2, MyBaseInst)
assert issubclass(MyBaseInst, MyBaseInst)
assert not issubclass(MyBaseInst, MyInst)
assert not issubclass(MyInst, MyInst2)
assert issubclass(MyInst, (MyBaseInst, MyClass))
assert issubclass(MyInst, (MyClass, (), (MyBaseInst,)))
assert not issubclass(MyInst, (MyClass, (), (MyInst2,)))
BBase = MyClass()
BSub1 = MyClass()
BSub2 = MyClass()
BBase.__bases__ = ()
BSub1.__bases__ = (BBase,)
BSub2.__bases__ = (BBase,)
assert issubclass(BSub1, BBase)
assert issubclass(BBase, BBase)
assert not issubclass(BBase, BSub1)
assert not issubclass(BSub1, BSub2)
assert not issubclass(MyInst, BSub1)
assert not issubclass(BSub1, MyInst)
del BBase.__bases__
raises(TypeError, issubclass, BSub1, BBase)
raises(TypeError, issubclass, BBase, BBase)
raises(TypeError, issubclass, BBase, BSub1)
assert not issubclass(BSub1, BSub2)
assert not issubclass(MyInst, BSub1)
assert not issubclass(BSub1, MyInst)
BBase.__bases__ = 42
raises(TypeError, issubclass, BSub1, BBase)
raises(TypeError, issubclass, BBase, BBase)
raises(TypeError, issubclass, BBase, BSub1)
assert not issubclass(BSub1, BSub2)
assert not issubclass(MyInst, BSub1)
assert not issubclass(BSub1, MyInst)
def test_overriding(self):
class ABC(type):
def __instancecheck__(cls, inst):
"""Implement isinstance(inst, cls)."""
return any(cls.__subclasscheck__(c)
for c in set([type(inst), inst.__class__]))
def __subclasscheck__(cls, sub):
"""Implement issubclass(sub, cls)."""
candidates = cls.__dict__.get("__subclass__", set()) | set([cls])
return any(c in candidates for c in sub.mro())
# Equivalent to::
# class Integer(metaclass=ABC):
# __subclass__ = set([int])
# But with a syntax compatible with 2.x
Integer = ABC('Integer', (), dict(__subclass__=set([int])))
assert issubclass(int, Integer)
assert issubclass(int, (Integer,))
def test_dont_call_instancecheck_fast_path(self):
called = []
class M(type):
def __instancecheck__(self, obj):
called.append("called")
class C:
__metaclass__ = M
c = C()
assert isinstance(c, C)
assert not called
def test_instancecheck_exception_not_eaten(self):
class M(object):
def __instancecheck__(self, obj):
raise TypeError("foobar")
e = raises(TypeError, isinstance, 42, M())
assert str(e.value) == "foobar"
def test_issubclass_exception_not_eaten(self):
class M(object):
def __subclasscheck__(self, subcls):
raise TypeError("foobar")
e = raises(TypeError, issubclass, 42, M())
assert str(e.value) == "foobar"
def test_issubclass_no_fallback(self):
class M(object):
def __subclasscheck__(self, subcls):
return False
assert issubclass(42, M()) is False
def test_exception_match_does_not_call_subclasscheck(self):
class Special(Exception):
class __metaclass__(type):
def __subclasscheck__(cls1, cls2):
return True
try:
raise ValueError
except ValueError: # Python 3.x behaviour
pass
def test_exception_raising_does_not_call_subclasscheck(self):
# test skipped: unsure how to get a non-normalized exception
# from pure Python.
class Special(Exception):
class __metaclass__(type):
def __subclasscheck__(cls1, cls2):
return True
try:
skip("non-normalized exception") #raise Special, ValueError()
except Special:
pass
def test_exception_bad_subclasscheck(self):
"""
import sys
class Meta(type):
def __subclasscheck__(cls, subclass):
raise ValueError()
class MyException(Exception, metaclass=Meta):
pass
try:
raise KeyError()
except MyException as e:
assert False, "exception should not be a MyException"
except KeyError:
pass
except:
assert False, "Should have raised KeyError"
else:
assert False, "Should have raised KeyError"
"""
def test_exception_contains_type_name(self):
with raises(TypeError) as e:
issubclass(type, None)
print(e.value)
assert "NoneType" in str(e.value)
|
