Lib/test/test_class.py

"Test the functionality of Python classes implementing operators."

from test.test_support import TestFailed

testmeths = [

# Binary operations
    "add",
    "radd",
    "sub",
    "rsub",
    "mul",
    "rmul",
    "truediv",
    "rtruediv",
    "mod",
    "rmod",
    "divmod",
    "rdivmod",
    "pow",
    "rpow",
    "rshift",
    "rrshift",
    "lshift",
    "rlshift",
    "and",
    "rand",
    "or",
    "ror",
    "xor",
    "rxor",

# List/dict operations
    "contains",
    "getitem",
    "getslice",
    "setitem",
    "setslice",
    "delitem",
    "delslice",

# Unary operations
    "neg",
    "pos",
    "abs",

# generic operations
    "init",
    ]

# These need to return something other than None
#    "hash",
#    "str",
#    "repr",
#    "int",
#    "long",
#    "float",
#    "oct",
#    "hex",

# These are separate because they can influence the test of other methods.
#    "getattr",
#    "setattr",
#    "delattr",

class AllTests:
    def __hash__(self, *args):
        print("__hash__:", args)
        return hash(id(self))

    def __str__(self, *args):
        print("__str__:", args)
        return "AllTests"

    def __repr__(self, *args):
        print("__repr__:", args)
        return "AllTests"

    def __int__(self, *args):
        print("__int__:", args)
        return 1

    def __index__(self, *args):
        print("__index__:", args)
        return 1

    def __float__(self, *args):
        print("__float__:", args)
        return 1.0

    def __cmp__(self, *args):
        print("__cmp__:", args)
        return 0

    def __eq__(self, *args):
        print("__eq__:", args)
        return True

    def __ne__(self, *args):
        print("__ne__:", args)
        return False

    def __lt__(self, *args):
        print("__lt__:", args)
        return False

    def __le__(self, *args):
        print("__le__:", args)
        return True

    def __gt__(self, *args):
        print("__gt__:", args)
        return False

    def __ge__(self, *args):
        print("__ge__:", args)
        return True

    def __del__(self, *args):
        print("__del__:", args)

# Synthesize AllTests methods from the names in testmeths.

method_template = """\
def __%(method)s__(self, *args):
    print("__%(method)s__:", args)
"""

d = {}
for method in testmeths:
    exec(method_template % locals(), d)
for k in d:
    setattr(AllTests, k, d[k])
del d, k
del method, method_template

# this also tests __init__ of course.
testme = AllTests()

# Binary operations

testme + 1
1 + testme

testme - 1
1 - testme

testme * 1
1 * testme

testme / 1
1 / testme

testme % 1
1 % testme

divmod(testme,1)
divmod(1, testme)

testme ** 1
1 ** testme

testme >> 1
1 >> testme

testme << 1
1 << testme

testme & 1
1 & testme

testme | 1
1 | testme

testme ^ 1
1 ^ testme


# List/dict operations

class Empty: pass

try:
    1 in Empty()
    print('failed, should have raised TypeError')
except TypeError:
    pass

1 in testme

testme[1]
testme[1] = 1
del testme[1]

testme[:42]
testme[:42] = "The Answer"
del testme[:42]

testme[2:1024:10]
testme[2:1024:10] = "A lot"
del testme[2:1024:10]

testme[:42, ..., :24:, 24, 100]
testme[:42, ..., :24:, 24, 100] = "Strange"
del testme[:42, ..., :24:, 24, 100]


# Now remove the slice hooks to see if converting normal slices to slice
# object works.

del AllTests.__getslice__
del AllTests.__setslice__
del AllTests.__delslice__

import sys
if sys.platform[:4] != 'java':
    testme[:42]
    testme[:42] = "The Answer"
    del testme[:42]
else:
    # This works under Jython, but the actual slice values are
    # different.
    print("__getitem__: (slice(0, 42, None),)")
    print("__setitem__: (slice(0, 42, None), 'The Answer')")
    print("__delitem__: (slice(0, 42, None),)")

# Unary operations

-testme
+testme
abs(testme)
int(testme)
int(testme)
float(testme)
oct(testme)

# And the rest...

hash(testme)
repr(testme)
str(testme)

testme == 1
testme < 1
testme > 1
testme != 1
1 == testme
1 < testme
1 > testme
1 != testme

# This test has to be last (duh.)

del testme
if sys.platform[:4] == 'java':
    import java
    java.lang.System.gc()

# Interfering tests

class ExtraTests:
    def __getattr__(self, *args):
        print("__getattr__:", args)
        return "SomeVal"

    def __setattr__(self, *args):
        print("__setattr__:", args)

    def __delattr__(self, *args):
        print("__delattr__:", args)

testme = ExtraTests()
testme.spam
testme.eggs = "spam, spam, spam and ham"
del testme.cardinal


# return values of some method are type-checked
class BadTypeClass:
    def __int__(self):
        return None
    __float__ = __int__
    __str__ = __int__
    __repr__ = __int__

def check_exc(stmt, exception):
    """Raise TestFailed if executing 'stmt' does not raise 'exception'
    """
    try:
        exec(stmt)
    except exception:
        pass
    else:
        raise TestFailed, "%s should raise %s" % (stmt, exception)

check_exc("int(BadTypeClass())", TypeError)
check_exc("float(BadTypeClass())", TypeError)
check_exc("str(BadTypeClass())", TypeError)
check_exc("repr(BadTypeClass())", TypeError)
check_exc("oct(BadTypeClass())", TypeError)
check_exc("hex(BadTypeClass())", TypeError)

# 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 C1:
    def __cmp__(self, other): return 0

check_exc("hash(C1())", TypeError)

class C2:
    def __eq__(self, other): return 1

check_exc("hash(C2())", TypeError)

# Test for SF bug 532646

class A:
    pass
A.__call__ = A()
a = A()
try:
    a() # This should not segfault
except RuntimeError:
    pass
else:
    raise TestFailed, "how could this not have overflowed the stack?"


# 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":
        print("attribute error for A().a got masked:", str(x))

class E:
    __eq__ = property(booh)
E() == E() # In debug mode, caused a C-level assert() to fail

class I:
    __init__ = property(booh)
try:
    I() # In debug mode, printed XXX undetected error and raises AttributeError
except AttributeError as x:
    pass
else:
    print("attribute error for I.__init__ got masked")


# 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 self.x == other.x
    def __hash__(self):
        return self.x
class B(A):
    pass

a1 = A(1)
a2 = A(2)
assert a1.f == a1.f
assert a1.f != a2.f
assert a1.f != a1.g
assert a1.f == A(1).f
assert hash(a1.f) == hash(a1.f)
assert hash(a1.f) == hash(A(1).f)

assert A.f != a1.f
assert A.f != A.g
assert B.f == A.f
assert hash(B.f) == hash(A.f)

# the following triggers a SystemError in 2.4
a = A(hash(A.f.im_func)^(-1))
hash(a.f)