__doc__ = u"""

>>> import sys

>>> if not IS_PY3: sys.exc_clear()

>>> print(sys.exc_info()[0]) # 0

None

>>> exc = test_c()

>>> isinstance(exc, TestException) or exc

True

>>> print(sys.exc_info()[0]) # test_c()

None

"""

import sys

IS_PY3 = sys.version_info[0] >= 3

class TestException(Exception):

    pass

def test_c():

    try:

        raise TestException

    except TestException, e:

        return e