test_descr.py

来自「mallet是自然语言处理、机器学习领域的一个开源项目。」· Python 代码 · 共 2,316 行 · 第 1/5 页

        def dmethod(self):
            return "D a"
        def all_method(self):
            return "D b"

    class M2(object, D):
        def m2method(self):
            return "M2 a"
        def all_method(self):
            return "M2 b"

    vereq(M2.__mro__, (M2, object, D, C))
    m = M2()
    vereq(m.cmethod(), "C a")
    vereq(m.dmethod(), "D a")
    vereq(m.m2method(), "M2 a")
    vereq(m.all_method(), "M2 b")

    class M3(M1, object, M2):
        def m3method(self):
            return "M3 a"
        def all_method(self):
            return "M3 b"
    # XXX Expected this (the commented-out result):
    # vereq(M3.__mro__, (M3, M1, M2, object, D, C))
    vereq(M3.__mro__, (M3, M1, M2, D, C, object))  # XXX ?
    m = M3()
    vereq(m.cmethod(), "C a")
    vereq(m.dmethod(), "D a")
    vereq(m.m1method(), "M1 a")
    vereq(m.m2method(), "M2 a")
    vereq(m.m3method(), "M3 a")
    vereq(m.all_method(), "M3 b")

    class Classic:
        pass
    try:
        class New(Classic):
            __metaclass__ = type
    except TypeError:
        pass
    else:
        raise TestFailed, "new class with only classic bases - shouldn't be"

def diamond():
    if verbose: print "Testing multiple inheritance special cases..."
    class A(object):
        def spam(self): return "A"
    vereq(A().spam(), "A")
    class B(A):
        def boo(self): return "B"
        def spam(self): return "B"
    vereq(B().spam(), "B")
    vereq(B().boo(), "B")
    class C(A):
        def boo(self): return "C"
    vereq(C().spam(), "A")
    vereq(C().boo(), "C")
    class D(B, C): pass
    vereq(D().spam(), "B")
    vereq(D().boo(), "B")
    vereq(D.__mro__, (D, B, C, A, object))
    class E(C, B): pass
    vereq(E().spam(), "B")
    vereq(E().boo(), "C")
    vereq(E.__mro__, (E, C, B, A, object))
    class F(D, E): pass
    vereq(F().spam(), "B")
    vereq(F().boo(), "B")
    vereq(F.__mro__, (F, D, E, B, C, A, object))
    class G(E, D): pass
    vereq(G().spam(), "B")
    vereq(G().boo(), "C")
    vereq(G.__mro__, (G, E, D, C, B, A, object))

def objects():
    if verbose: print "Testing object class..."
    a = object()
    vereq(a.__class__, object)
    vereq(type(a), object)
    b = object()
    verify(a is not b)
    verify(not hasattr(a, "foo"))
    try:
        a.foo = 12
    except (AttributeError, TypeError):
        pass
    else:
        verify(0, "object() should not allow setting a foo attribute")
    verify(not hasattr(object(), "__dict__"))

    class Cdict(object):
        pass
    x = Cdict()
    vereq(x.__dict__, {})
    x.foo = 1
    vereq(x.foo, 1)
    vereq(x.__dict__, {'foo': 1})

def slots():
    if verbose: print "Testing __slots__..."
    class C0(object):
        __slots__ = []
    x = C0()
    verify(not hasattr(x, "__dict__"))
    verify(not hasattr(x, "foo"))

    class C1(object):
        __slots__ = ['a']
    x = C1()
    verify(not hasattr(x, "__dict__"))
    verify(not hasattr(x, "a"))
    x.a = 1
    vereq(x.a, 1)
    x.a = None
    veris(x.a, None)
    del x.a
    verify(not hasattr(x, "a"))

    class C3(object):
        __slots__ = ['a', 'b', 'c']
    x = C3()
    verify(not hasattr(x, "__dict__"))
    verify(not hasattr(x, 'a'))
    verify(not hasattr(x, 'b'))
    verify(not hasattr(x, 'c'))
    x.a = 1
    x.b = 2
    x.c = 3
    vereq(x.a, 1)
    vereq(x.b, 2)
    vereq(x.c, 3)

    # Test leaks
    class Counted(object):
        counter = 0    # counts the number of instances alive
        def __init__(self):
            Counted.counter += 1
        def __del__(self):
            Counted.counter -= 1
    class C(object):
        __slots__ = ['a', 'b', 'c']
    x = C()
    x.a = Counted()
    x.b = Counted()
    x.c = Counted()
    vereq(Counted.counter, 3)
    del x
    vereq(Counted.counter, 0)
    class D(C):
        pass
    x = D()
    x.a = Counted()
    x.z = Counted()
    vereq(Counted.counter, 2)
    del x
    vereq(Counted.counter, 0)
    class E(D):
        __slots__ = ['e']
    x = E()
    x.a = Counted()
    x.z = Counted()
    x.e = Counted()
    vereq(Counted.counter, 3)
    del x
    vereq(Counted.counter, 0)

    # Test cyclical leaks [SF bug 519621]
    class F(object):
        __slots__ = ['a', 'b']
    log = []
    s = F()
    s.a = [Counted(), s]
    vereq(Counted.counter, 1)
    s = None
    import gc
    gc.collect()
    vereq(Counted.counter, 0)

    # Test lookup leaks [SF bug 572567]
    import sys,gc
    class G(object):
        def __cmp__(self, other):
            return 0
    g = G()
    orig_objects = len(gc.get_objects())
    for i in xrange(10):
        g==g
    new_objects = len(gc.get_objects())
    vereq(orig_objects, new_objects)

def dynamics():
    if verbose: print "Testing class attribute propagation..."
    class D(object):
        pass
    class E(D):
        pass
    class F(D):
        pass
    D.foo = 1
    vereq(D.foo, 1)
    # Test that dynamic attributes are inherited
    vereq(E.foo, 1)
    vereq(F.foo, 1)
    # Test dynamic instances
    class C(object):
        pass
    a = C()
    verify(not hasattr(a, "foobar"))
    C.foobar = 2
    vereq(a.foobar, 2)
    C.method = lambda self: 42
    vereq(a.method(), 42)
    C.__repr__ = lambda self: "C()"
    vereq(repr(a), "C()")
    C.__int__ = lambda self: 100
    vereq(int(a), 100)
    vereq(a.foobar, 2)
    verify(not hasattr(a, "spam"))
    def mygetattr(self, name):
        if name == "spam":
            return "spam"
        raise AttributeError
    C.__getattr__ = mygetattr
    vereq(a.spam, "spam")
    a.new = 12
    vereq(a.new, 12)
    def mysetattr(self, name, value):
        if name == "spam":
            raise AttributeError
        return object.__setattr__(self, name, value)
    C.__setattr__ = mysetattr
    try:
        a.spam = "not spam"
    except AttributeError:
        pass
    else:
        verify(0, "expected AttributeError")
    vereq(a.spam, "spam")
    class D(C):
        pass
    d = D()
    d.foo = 1
    vereq(d.foo, 1)

    # Test handling of int*seq and seq*int
    class I(int):
        pass
    vereq("a"*I(2), "aa")
    vereq(I(2)*"a", "aa")
    vereq(2*I(3), 6)
    vereq(I(3)*2, 6)
    vereq(I(3)*I(2), 6)

    # Test handling of long*seq and seq*long
    class L(long):
        pass
    vereq("a"*L(2L), "aa")
    vereq(L(2L)*"a", "aa")
    vereq(2*L(3), 6)
    vereq(L(3)*2, 6)
    vereq(L(3)*L(2), 6)

    # Test comparison of classes with dynamic metaclasses
    class dynamicmetaclass(type):
        pass
    class someclass:
        __metaclass__ = dynamicmetaclass
    verify(someclass != object)

def errors():
    if verbose: print "Testing errors..."

    try:
        class C(list, dict):
            pass
    except TypeError:
        pass
    else:
        verify(0, "inheritance from both list and dict should be illegal")

    try:
        class C(object, None):
            pass
    except TypeError:
        pass
    else:
        verify(0, "inheritance from non-type should be illegal")
    class Classic:
        pass

    try:
        class C(type(len)):
            pass
    except TypeError:
        pass
    else:
        verify(0, "inheritance from CFunction should be illegal")

    try:
        class C(object):
            __slots__ = 1
    except TypeError:
        pass
    else:
        verify(0, "__slots__ = 1 should be illegal")

    try:
        class C(object):
            __slots__ = [1]
    except TypeError:
        pass
    else:
        verify(0, "__slots__ = [1] should be illegal")

def classmethods():
    if verbose: print "Testing class methods..."
    class C(object):
        def foo(*a): return a
        goo = classmethod(foo)
    c = C()
    vereq(C.goo(1), (C, 1))
    vereq(c.goo(1), (C, 1))
    vereq(c.foo(1), (c, 1))
    class D(C):
        pass
    d = D()
    vereq(D.goo(1), (D, 1))
    vereq(d.goo(1), (D, 1))
    vereq(d.foo(1), (d, 1))
    vereq(D.foo(d, 1), (d, 1))
    # Test for a specific crash (SF bug 528132)
    def f(cls, arg): return (cls, arg)
    ff = classmethod(f)
    vereq(ff.__get__(0, int)(42), (int, 42))
    vereq(ff.__get__(0)(42), (int, 42))

    # Test super() with classmethods (SF bug 535444)
    veris(C.goo.im_self, C)
    veris(D.goo.im_self, D)
    veris(super(D,D).goo.im_self, D)
    veris(super(D,d).goo.im_self, D)
    vereq(super(D,D).goo(), (D,))
    vereq(super(D,d).goo(), (D,))

def staticmethods():
    if verbose: print "Testing static methods..."
    class C(object):
        def foo(*a): return a
        goo = staticmethod(foo)
    c = C()
    vereq(C.goo(1), (1,))
    vereq(c.goo(1), (1,))
    vereq(c.foo(1), (c, 1,))
    class D(C):
        pass
    d = D()
    vereq(D.goo(1), (1,))
    vereq(d.goo(1), (1,))
    vereq(d.foo(1), (d, 1))
    vereq(D.foo(d, 1), (d, 1))

def classic():
    if verbose: print "Testing classic classes..."
    class C:
        def foo(*a): return a
        goo = classmethod(foo)
    c = C()
    vereq(C.goo(1), (C, 1))
    vereq(c.goo(1), (C, 1))
    vereq(c.foo(1), (c, 1))
    class D(C):
        pass
    d = D()
    vereq(D.goo(1), (D, 1))
    vereq(d.goo(1), (D, 1))
    vereq(d.foo(1), (d, 1))
    vereq(D.foo(d, 1), (d, 1))
    class E: # *not* subclassing from C
        foo = C.foo
    vereq(E().foo, C.foo) # i.e., unbound
    verify(repr(C.foo.__get__(C())).startswith("<bound method "))

def compattr():
    if verbose: print "Testing computed attributes..."
    class C(object):
        class computed_attribute(object):
            def __init__(self, get, set=None, delete=None):
                self.__get = get
                self.__set = set
                self.__delete = delete
            def __get__(self, obj, type=None):
                return self.__get(obj)
            def __set__(self, obj, value):
                return self.__set(obj, value)
            def __delete__(self, obj):
                return self.__delete(obj)
        def __init__(self):
            self.__x = 0
        def __get_x(self):
            x = self.__x
            self.__x = x+1
            return x
        def __set_x(self, x):
            self.__x = x
        def __delete_x(self):
            del self.__x
        x = computed_attribute(__get_x, __set_x, __delete_x)
    a = C()
    vereq(a.x, 0)
    vereq(a.x, 1)
    a.x = 10
    vereq(a.x, 10)
    vereq(a.x, 11)
    del a.x
    vereq(hasattr(a, 'x'), 0)

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)

def altmro():
    if verbose: print "Testing mro() and overriding it..."
    class A(object):
        def f(self): return "A"
    class B(A):
        pass
    class C(A):
        def f(self): return "C"
    class D(B, C):
        pass
    vereq(D.mro(), [D, B, C, A, object])
    vereq(D.__mro__, (D, B, C, A, object))
    vereq(D().f(), "C")
    class PerverseMetaType(type):
        def mro(cls):
            L = type.mro(cls)
            L.reverse()
            return L
    class X(A,B,C,D):
        __metaclass__ = PerverseMetaType
    vereq(X.__mro__, (object, A, C, B, D, X))
    vereq(X().f(), "A")

def overloading():
    if verbose: print "Testing operator overloading..."

    class B(object):
        "Intermediate class because object doesn't have a __setattr__"