Python ModuleType.__new__方法代码示例

# 需要导入模块: from types import ModuleType [as 别名]
# 或者: from types.ModuleType import __new__ [as 别名]
def test_newslots(self):
        # Testing __new__ slot override...
        class C(list):
            def __new__(cls):
                self = list.__new__(cls)
                self.foo = 1
                return self
            def __init__(self):
                self.foo = self.foo + 2
        a = C()
        self.assertEqual(a.foo, 3)
        self.assertEqual(a.__class__, C)
        class D(C):
            pass
        b = D()
        self.assertEqual(b.foo, 3)
        self.assertEqual(b.__class__, D) 

# 需要导入模块: from types import ModuleType [as 别名]
# 或者: from types.ModuleType import __new__ [as 别名]
def test_restored_object_new(self):
        class A(object):
            def __new__(cls, *args, **kwargs):
                raise AssertionError
        self.assertRaises(AssertionError, A)
        class B(A):
            __new__ = object.__new__
            def __init__(self, foo):
                self.foo = foo
        with warnings.catch_warnings():
            warnings.simplefilter('error', DeprecationWarning)
            b = B(3)
        self.assertEqual(b.foo, 3)
        self.assertEqual(b.__class__, B)
        del B.__new__
        self.assertRaises(AssertionError, B)
        del A.__new__
        with warnings.catch_warnings():
            warnings.simplefilter('error', DeprecationWarning)
            b = B(3)
        self.assertEqual(b.foo, 3)
        self.assertEqual(b.__class__, B) 

# 需要导入模块: from types import ModuleType [as 别名]
# 或者: from types.ModuleType import __new__ [as 别名]
def test_recursions_1(self):
        # Testing recursion checks ...
        class Letter(str):
            def __new__(cls, letter):
                if letter == 'EPS':
                    return str.__new__(cls)
                return str.__new__(cls, letter)
            def __str__(self):
                if not self:
                    return 'EPS'
                return self
        # sys.stdout needs to be the original to trigger the recursion bug
        test_stdout = sys.stdout
        sys.stdout = test_support.get_original_stdout()
        try:
            # nothing should actually be printed, this should raise an exception
            print Letter('w')
        except RuntimeError:
            pass
        else:
            self.fail("expected a RuntimeError for print recursion")
        finally:
            sys.stdout = test_stdout 

# 需要导入模块: from types import ModuleType [as 别名]
# 或者: from types.ModuleType import __new__ [as 别名]
def test_funny_new(self):
        # Testing __new__ returning something unexpected...
        class C(object):
            def __new__(cls, arg):
                if isinstance(arg, str): return [1, 2, 3]
                elif isinstance(arg, int): return object.__new__(D)
                else: return object.__new__(cls)
        class D(C):
            def __init__(self, arg):
                self.foo = arg
        self.assertEqual(C("1"), [1, 2, 3])
        self.assertEqual(D("1"), [1, 2, 3])
        d = D(None)
        self.assertEqual(d.foo, None)
        d = C(1)
        self.assertIsInstance(d, D)
        self.assertEqual(d.foo, 1)
        d = D(1)
        self.assertIsInstance(d, D)
        self.assertEqual(d.foo, 1) 

# 需要导入模块: from types import ModuleType [as 别名]
# 或者: from types.ModuleType import __new__ [as 别名]
def test_object_new_and_init_with_parameters(self):
        # See issue #1683368
        class OverrideNeither:
            pass
        self.assertRaises(TypeError, OverrideNeither, 1)
        self.assertRaises(TypeError, OverrideNeither, kw=1)
        class OverrideNew:
            def __new__(cls, foo, kw=0, *args, **kwds):
                return object.__new__(cls, *args, **kwds)
        class OverrideInit:
            def __init__(self, foo, kw=0, *args, **kwargs):
                return object.__init__(self, *args, **kwargs)
        class OverrideBoth(OverrideNew, OverrideInit):
            pass
        for case in OverrideNew, OverrideInit, OverrideBoth:
            case(1)
            case(1, kw=2)
            self.assertRaises(TypeError, case, 1, 2, 3)
            self.assertRaises(TypeError, case, 1, 2, foo=3) 

# 需要导入模块: from types import ModuleType [as 别名]
# 或者: from types.ModuleType import __new__ [as 别名]
def newslot():
    if verbose: print "Testing __new__ slot override..."
    class C(list):
        def __new__(cls):
            self = list.__new__(cls)
            self.foo = 1
            return self
        def __init__(self):
            self.foo = self.foo + 2
    a = C()
    vereq(a.foo, 3)
    verify(a.__class__ is C)
    class D(C):
        pass
    b = D()
    vereq(b.foo, 3)
    verify(b.__class__ is D) 

# 需要导入模块: from types import ModuleType [as 别名]
# 或者: from types.ModuleType import __new__ [as 别名]
def funnynew():
    if verbose: print "Testing __new__ returning something unexpected..."
    class C(object):
        def __new__(cls, arg):
            if isinstance(arg, str): return [1, 2, 3]
            elif isinstance(arg, int): return object.__new__(D)
            else: return object.__new__(cls)
    class D(C):
        def __init__(self, arg):
            self.foo = arg
    vereq(C("1"), [1, 2, 3])
    vereq(D("1"), [1, 2, 3])
    d = D(None)
    veris(d.foo, None)
    d = C(1)
    vereq(isinstance(d, D), True)
    vereq(d.foo, 1)
    d = D(1)
    vereq(isinstance(d, D), True)
    vereq(d.foo, 1) 

# 需要导入模块: from types import ModuleType [as 别名]
# 或者: from types.ModuleType import __new__ [as 别名]
def test_complexes(self):
        # Testing complex operations...
        self.number_operators(100.0j, 3.0j, skip=['lt', 'le', 'gt', 'ge',
                                                  'int', 'long', 'float'])

        class Number(complex):
            __slots__ = ['prec']
            def __new__(cls, *args, **kwds):
                result = complex.__new__(cls, *args)
                result.prec = kwds.get('prec', 12)
                return result
            def __repr__(self):
                prec = self.prec
                if self.imag == 0.0:
                    return "%.*g" % (prec, self.real)
                if self.real == 0.0:
                    return "%.*gj" % (prec, self.imag)
                return "(%.*g+%.*gj)" % (prec, self.real, prec, self.imag)
            __str__ = __repr__

        a = Number(3.14, prec=6)
        self.assertEqual(repr(a), "3.14")
        self.assertEqual(a.prec, 6)

        a = Number(a, prec=2)
        self.assertEqual(repr(a), "3.1")
        self.assertEqual(a.prec, 2)

        a = Number(234.5)
        self.assertEqual(repr(a), "234.5")
        self.assertEqual(a.prec, 12) 

# 需要导入模块: from types import ModuleType [as 别名]
# 或者: from types.ModuleType import __new__ [as 别名]
def test_bad_new(self):
        self.assertRaises(TypeError, object.__new__)
        self.assertRaises(TypeError, object.__new__, '')
        self.assertRaises(TypeError, list.__new__, object)
        self.assertRaises(TypeError, object.__new__, list)
        class C(object):
            __new__ = list.__new__
        self.assertRaises(TypeError, C)
        class C(list):
            __new__ = object.__new__
        self.assertRaises(TypeError, C) 

# 需要导入模块: from types import ModuleType [as 别名]
# 或者: from types.ModuleType import __new__ [as 别名]
def test_uninitialized_modules(self):
        # Testing uninitialized module objects...
        from types import ModuleType as M
        m = M.__new__(M)
        str(m)
        self.assertNotHasAttr(m, "__name__")
        self.assertNotHasAttr(m, "__file__")
        self.assertNotHasAttr(m, "foo")
        self.assertFalse(m.__dict__)   # None or {} are both reasonable answers
        m.foo = 1
        self.assertEqual(m.__dict__, {"foo": 1}) 

# 需要导入模块: from types import ModuleType [as 别名]
# 或者: from types.ModuleType import __new__ [as 别名]
def test_funny_new(self):
        # Testing __new__ returning something unexpected...
        class C(object):
            def __new__(cls, arg):
                if isinstance(arg, str): return [1, 2, 3]
                elif isinstance(arg, int): return object.__new__(D)
                else: return object.__new__(cls)
        class D(C):
            def __init__(self, arg):
                self.foo = arg
        self.assertEqual(C("1"), [1, 2, 3])
        self.assertEqual(D("1"), [1, 2, 3])
        d = D(None)
        self.assertEqual(d.foo, None)
        d = C(1)
        self.assertEqual(isinstance(d, D), True)
        self.assertEqual(d.foo, 1)
        d = D(1)
        self.assertEqual(isinstance(d, D), True)
        self.assertEqual(d.foo, 1)

        class C(object):
            @staticmethod
            def __new__(*args):
                return args
        self.assertEqual(C(1, 2), (C, 1, 2))
        class D(C):
            pass
        self.assertEqual(D(1, 2), (D, 1, 2))

        class C(object):
            @classmethod
            def __new__(*args):
                return args
        self.assertEqual(C(1, 2), (C, C, 1, 2))
        class D(C):
            pass
        self.assertEqual(D(1, 2), (D, D, 1, 2)) 

# 需要导入模块: from types import ModuleType [as 别名]
# 或者: from types.ModuleType import __new__ [as 别名]
def test_unintialized_modules(self):
        # Testing uninitialized module objects...
        from types import ModuleType as M
        m = M.__new__(M)
        str(m)
        self.assertEqual(hasattr(m, "__name__"), 0)
        self.assertEqual(hasattr(m, "__file__"), 0)
        self.assertEqual(hasattr(m, "foo"), 0)
        self.assertFalse(m.__dict__)   # None or {} are both reasonable answers
        m.foo = 1
        self.assertEqual(m.__dict__, {"foo": 1})