import contextlib
import sys

target = {'foo': 'FOO'}


def is_instance(obj, klass):
    """Version of is_instance that doesn't access __class__"""
    return issubclass(type(obj), klass)


class SomeClass(object):
    class_attribute = None

    def wibble(self): pass


class X(object):
    pass


@contextlib.contextmanager
def uncache(*names):
    """Uncache a module from sys.modules.

    A basic sanity check is performed to prevent uncaching modules that either
    cannot/shouldn't be uncached.

    """
    for name in names:
        assert name not in ('sys', 'marshal', 'imp')
        try:
            del sys.modules[name]
        except KeyError:
            pass
    try:
        yield
    finally:
        for name in names:
            del sys.modules[name]


class _ALWAYS_EQ:
    """
    Object that is equal to anything.
    """
    def __eq__(self, other):
        return True
    def __ne__(self, other):
        return False

ALWAYS_EQ = _ALWAYS_EQ()