test_descr.py

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    class C(B):

        def __getattr__(self, name):
            if name == "foo":
                return ("getattr", name)
            else:
                raise AttributeError
        def __setattr__(self, name, value):
            if name == "foo":
                self.setattr = (name, value)
            else:
                return B.__setattr__(self, name, value)
        def __delattr__(self, name):
            if name == "foo":
                self.delattr = name
            else:
                return B.__delattr__(self, name)

        def __getitem__(self, key):
            return ("getitem", key)
        def __setitem__(self, key, value):
            self.setitem = (key, value)
        def __delitem__(self, key):
            self.delitem = key

        def __getslice__(self, i, j):
            return ("getslice", i, j)
        def __setslice__(self, i, j, value):
            self.setslice = (i, j, value)
        def __delslice__(self, i, j):
            self.delslice = (i, j)

    a = C()
    vereq(a.foo, ("getattr", "foo"))
    a.foo = 12
    vereq(a.setattr, ("foo", 12))
    del a.foo
    vereq(a.delattr, "foo")

    vereq(a[12], ("getitem", 12))
    a[12] = 21
    vereq(a.setitem, (12, 21))
    del a[12]
    vereq(a.delitem, 12)

    vereq(a[0:10], ("getslice", 0, 10))
    a[0:10] = "foo"
    vereq(a.setslice, (0, 10, "foo"))
    del a[0:10]
    vereq(a.delslice, (0, 10))

def methods():
    if verbose: print "Testing methods..."
    class C(object):
        def __init__(self, x):
            self.x = x
        def foo(self):
            return self.x
    c1 = C(1)
    vereq(c1.foo(), 1)
    class D(C):
        boo = C.foo
        goo = c1.foo
    d2 = D(2)
    vereq(d2.foo(), 2)
    vereq(d2.boo(), 2)
    vereq(d2.goo(), 1)
    class E(object):
        foo = C.foo
    vereq(E().foo, C.foo) # i.e., unbound
    verify(repr(C.foo.__get__(C(1))).startswith("<bound method "))

def specials():
    # Test operators like __hash__ for which a built-in default exists
    if verbose: print "Testing special operators..."
    # Test the default behavior for static classes
    class C(object):
        def __getitem__(self, i):
            if 0 <= i < 10: return i
            raise IndexError
    c1 = C()
    c2 = C()
    verify(not not c1)
    vereq(hash(c1), id(c1))
    vereq(cmp(c1, c2), cmp(id(c1), id(c2)))
    vereq(c1, c1)
    verify(c1 != c2)
    verify(not c1 != c1)
    verify(not c1 == c2)
    # Note that the module name appears in str/repr, and that varies
    # depending on whether this test is run standalone or from a framework.
    verify(str(c1).find('C object at ') >= 0)
    vereq(str(c1), repr(c1))
    verify(-1 not in c1)
    for i in range(10):
        verify(i in c1)
    verify(10 not in c1)
    # Test the default behavior for dynamic classes
    class D(object):
        def __getitem__(self, i):
            if 0 <= i < 10: return i
            raise IndexError
    d1 = D()
    d2 = D()
    verify(not not d1)
    vereq(hash(d1), id(d1))
    vereq(cmp(d1, d2), cmp(id(d1), id(d2)))
    vereq(d1, d1)
    verify(d1 != d2)
    verify(not d1 != d1)
    verify(not d1 == d2)
    # Note that the module name appears in str/repr, and that varies
    # depending on whether this test is run standalone or from a framework.
    verify(str(d1).find('D object at ') >= 0)
    vereq(str(d1), repr(d1))
    verify(-1 not in d1)
    for i in range(10):
        verify(i in d1)
    verify(10 not in d1)
    # Test overridden behavior for static classes
    class Proxy(object):
        def __init__(self, x):
            self.x = x
        def __nonzero__(self):
            return not not self.x
        def __hash__(self):
            return hash(self.x)
        def __eq__(self, other):
            return self.x == other
        def __ne__(self, other):
            return self.x != other
        def __cmp__(self, other):
            return cmp(self.x, other.x)
        def __str__(self):
            return "Proxy:%s" % self.x
        def __repr__(self):
            return "Proxy(%r)" % self.x
        def __contains__(self, value):
            return value in self.x
    p0 = Proxy(0)
    p1 = Proxy(1)
    p_1 = Proxy(-1)
    verify(not p0)
    verify(not not p1)
    vereq(hash(p0), hash(0))
    vereq(p0, p0)
    verify(p0 != p1)
    verify(not p0 != p0)
    vereq(not p0, p1)
    vereq(cmp(p0, p1), -1)
    vereq(cmp(p0, p0), 0)
    vereq(cmp(p0, p_1), 1)
    vereq(str(p0), "Proxy:0")
    vereq(repr(p0), "Proxy(0)")
    p10 = Proxy(range(10))
    verify(-1 not in p10)
    for i in range(10):
        verify(i in p10)
    verify(10 not in p10)
    # Test overridden behavior for dynamic classes
    class DProxy(object):
        def __init__(self, x):
            self.x = x
        def __nonzero__(self):
            return not not self.x
        def __hash__(self):
            return hash(self.x)
        def __eq__(self, other):
            return self.x == other
        def __ne__(self, other):
            return self.x != other
        def __cmp__(self, other):
            return cmp(self.x, other.x)
        def __str__(self):
            return "DProxy:%s" % self.x
        def __repr__(self):
            return "DProxy(%r)" % self.x
        def __contains__(self, value):
            return value in self.x
    p0 = DProxy(0)
    p1 = DProxy(1)
    p_1 = DProxy(-1)
    verify(not p0)
    verify(not not p1)
    vereq(hash(p0), hash(0))
    vereq(p0, p0)
    verify(p0 != p1)
    verify(not p0 != p0)
    vereq(not p0, p1)
    vereq(cmp(p0, p1), -1)
    vereq(cmp(p0, p0), 0)
    vereq(cmp(p0, p_1), 1)
    vereq(str(p0), "DProxy:0")
    vereq(repr(p0), "DProxy(0)")
    p10 = DProxy(range(10))
    verify(-1 not in p10)
    for i in range(10):
        verify(i in p10)
    verify(10 not in p10)
    # Safety test for __cmp__
    def unsafecmp(a, b):
        try:
            a.__class__.__cmp__(a, b)
        except TypeError:
            pass
        else:
            raise TestFailed, "shouldn't allow %s.__cmp__(%r, %r)" % (
                a.__class__, a, b)
    unsafecmp(u"123", "123")
    unsafecmp("123", u"123")
    unsafecmp(1, 1.0)
    unsafecmp(1.0, 1)
    unsafecmp(1, 1L)
    unsafecmp(1L, 1)

    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
    import sys
    test_stdout = sys.stdout
    sys.stdout = get_original_stdout()
    try:
        # nothing should actually be printed, this should raise an exception
        print Letter('w')
    except RuntimeError:
        pass
    else:
        raise TestFailed, "expected a RuntimeError for print recursion"
    sys.stdout = test_stdout

def weakrefs():
    if verbose: print "Testing weak references..."
    import weakref
    class C(object):
        pass
    c = C()
    r = weakref.ref(c)
    verify(r() is c)
    del c
    verify(r() is None)
    del r
    class NoWeak(object):
        __slots__ = ['foo']
    no = NoWeak()
    try:
        weakref.ref(no)
    except TypeError, msg:
        verify(str(msg).find("weak reference") >= 0)
    else:
        verify(0, "weakref.ref(no) should be illegal")
    class Weak(object):
        __slots__ = ['foo', '__weakref__']
    yes = Weak()
    r = weakref.ref(yes)
    verify(r() is yes)
    del yes
    verify(r() is None)
    del r

def properties():
    if verbose: print "Testing property..."
    class C(object):
        def getx(self):
            return self.__x
        def setx(self, value):
            self.__x = value
        def delx(self):
            del self.__x
        x = property(getx, setx, delx, doc="I'm the x property.")
    a = C()
    verify(not hasattr(a, "x"))
    a.x = 42
    vereq(a._C__x, 42)
    vereq(a.x, 42)
    del a.x
    verify(not hasattr(a, "x"))
    verify(not hasattr(a, "_C__x"))
    C.x.__set__(a, 100)
    vereq(C.x.__get__(a), 100)
    C.x.__delete__(a)
    verify(not hasattr(a, "x"))

    raw = C.__dict__['x']
    verify(isinstance(raw, property))

    attrs = dir(raw)
    verify("__doc__" in attrs)
    verify("fget" in attrs)
    verify("fset" in attrs)
    verify("fdel" in attrs)

    vereq(raw.__doc__, "I'm the x property.")
    verify(raw.fget is C.__dict__['getx'])
    verify(raw.fset is C.__dict__['setx'])
    verify(raw.fdel is C.__dict__['delx'])

    for attr in "__doc__", "fget", "fset", "fdel":
        try:
            setattr(raw, attr, 42)
        except TypeError, msg:
            if str(msg).find('readonly') < 0:
                raise TestFailed("when setting readonly attr %r on a "
                                 "property, got unexpected TypeError "
                                 "msg %r" % (attr, str(msg)))
        else:
            raise TestFailed("expected TypeError from trying to set "
                             "readonly %r attr on a property" % attr)

    class D(object):
        __getitem__ = property(lambda s: 1/0)

    d = D()
    try:
        for i in d:
            str(i)
    except ZeroDivisionError:
        pass
    else:
        raise TestFailed, "expected ZeroDivisionError from bad property"

def supers():
    if verbose: print "Testing super..."

    class A(object):
        def meth(self, a):
            return "A(%r)" % a

    vereq(A().meth(1), "A(1)")

    class B(A):
        def __init__(self):
            self.__super = super(B, self)
        def meth(self, a):
            return "B(%r)" % a + self.__super.meth(a)

    vereq(B().meth(2), "B(2)A(2)")

    class C(A):
        def meth(self, a):
            return "C(%r)" % a + self.__super.meth(a)
    C._C__super = super(C)

    vereq(C().meth(3), "C(3)A(3)")

    class D(C, B):
        def meth(self, a):
            return "D(%r)" % a + super(D, self).meth(a)

    vereq(D().meth(4), "D(4)C(4)B(4)A(4)")

    # Test for subclassing super

    class mysuper(super):
        def __init__(self, *args):
            return super(mysuper, self).__init__(*args)

    class E(D):
        def meth(self, a):
            return "E(%r)" % a + mysuper(E, self).meth(a)

    vereq(E().meth(5), "E(5)D(5)C(5)B(5)A(5)")

    class F(E):
        def meth(self, a):
            s = self.__super
            return "F(%r)[%s]" % (a, s.__class__.__name__) + s.meth(a)
    F._F__super = mysuper(F)

    vereq(F().meth(6), "F(6)[mysuper]E(6)D(6)C(6)B(6)A(6)")

    # Make sure certain errors are raised

    try:
        super(D, 42)
    except TypeError:
        pass
    else:
        raise TestFailed, "shouldn't allow super(D, 42)"

    try:
        super(D, C())
    except TypeError:
        pass
    else:
        raise TestFailed, "shouldn't allow super(D, C())"

    try:
        super(D).__get__(12)
    except TypeError:
        pass
    else:
        raise TestFailed, "shouldn't allow super(D).__get__(12)"

    try:
        super(D).__get__(C())
    except TypeError:
        pass
    else:
        raise TestFailed, "shouldn't allow super(D).__get__(C())"

def inherits():
    if verbose: print "Testing inheritance from basic types..."

    class hexint(int):
        def __repr__(self):
            return hex(self)
        def __add__(self, other):
            return hexint(int.__add__(self, other))
        # (Note that overriding __radd__ doesn't work,
        # because the int type gets first dibs.)
    vereq(repr(hexint(7) + 9), "0x10")
    vereq(repr(hexint(1000) + 7), "0x3ef")
    a = hexint(12345)
    vereq(a, 12345)
    vereq(int(a), 12345)
    verify(int(a).__class__ is int)
    vereq(hash(a), hash(12345))
    verify((+a).__class__ is int)
    verify((a >> 0).__class__ is int)
    verify((a << 0).__class__ is int)
    verify((hexint(0) << 12).__class__ is int)
    verify((hexint(0) >> 12).__class__ is int)

    class octlong(long):
        __slots__ = []
        def __str__(self):
            s = oct(self)
            if s[-1] == 'L':
                s = s[:-1]
            return s
        def __add__(self, other):
            return self.__class__(super(octlong, self).__add__(other))
        __radd__ = __add__
    vereq(str(octlong(3) + 5), "010")
    # (Note that overriding __radd__ here only seems to work
    # because the example uses a short int left argument.)
    vereq(str(5 + octlong(3000)), "05675")
    a = octlong(12345)
    vereq(a, 12345L)
    vereq(long(a), 12345L)
    vereq(hash(a), hash(12345L))
    verify(long(a).__class__ is long)
    verify((+a).__class__ is long)
    verify((-a).__class__ is long)
    verify((-octlong(0)).__class__ is long)
    verify((a >> 0).__class__ is long)
    verify((a << 0).__class__ is long)
    verify((a - 0).__class__ is long)
    verify((a * 1).__class__ is long)
    verify((a ** 1).__class__ is long)
    verify((a // 1).__class__ is long)
    verify((1 * a).__class__ is long)
    verify((a | 0).__class__ is long)
    verify((a ^ 0).__class__ is long)
    verify((a & -1L).__class__ is long)
    verify((octlong(0) << 12).__class__ is long)