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Python exceptions can't propagate from an "except +" function #2603

godlygeek opened this Issue Sep 12, 2018 · 1 comment


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godlygeek commented Sep 12, 2018

I couldn't find an existing issue for this; hopefully I didn't miss one.

Given this code in test.pyx

# distutils: language = c++

cdef func() except +:
    raise NotImplementedError()

def call_func():

the interpreter will segfault if you call test.call_func(). This appears to be caused by Cython disabling all other exception handling if except + is specified, including the check for whether NULL was returned after a Python exception was set.

My expectation was that I could use the except + to handle truly unexpected things like std::bad_alloc, while explicitly raising Python exceptions for less exceptional exceptions.


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robertwb Sep 13, 2018


robertwb commented Sep 13, 2018

@robertwb robertwb closed this in #2610 Sep 17, 2018

robertwb pushed a commit that referenced this issue Sep 17, 2018

robertwb added a commit that referenced this issue Sep 17, 2018

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