cython

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__doc__ = u"""
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>>> def bar():
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...     try:
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...         foo()
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...     except ValueError:
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...         print(isinstance(sys.exc_info()[1].__cause__, TypeError))
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>>> bar()
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True
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>>> print(sys.exc_info())
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(None, None, None)
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>>> def bar2():
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...     try:
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...         foo2()
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...     except ValueError:
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...         cause = sys.exc_info()[1].__cause__
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...         print(isinstance(cause, TypeError))
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...         print(cause.args==('value',))
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...         pass
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>>> bar2()
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True
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True
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"""
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import sys
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def foo():
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    try:
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        raise TypeError
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    except TypeError:
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        raise ValueError from TypeError
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def foo2():
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    try:
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        raise TypeError
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    except TypeError:
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        raise ValueError() from TypeError('value')
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