__doc__ = u"""
>>> try: exc()
... except IndexError:
... if IS_PY3:
... print(isinstance(sys.exc_info()[1].__context__, ValueError))
... else:
... print(True)
True
"""
import sys
IS_PY3 = sys.version_info[0] >= 3
def exc():
try:
raise ValueError
except ValueError:
raise IndexError