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How do I raise an exception in Cython code that will be visible to ancestor (in the callstack) CPython code?

April 26, 2017ancestor callstack code cpython cython exception raise visible

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How do I raise an exception in Cython code that will be visible to ancestor (in the callstack) CPython code?

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If your cdef or cpdef function or method does not declare a return type (as is normal in CPython code), then you get exceptions without any extra effort.