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If this functionality is important to you please file a feature request at: https://github.com/numba/numba/issues/new s Unsupported Python functionality was found in the code Numba was trying to compile. This error could be due to invalid code, does the code work without Numba? (To temporarily disable Numba JIT, set the `NUMBA_DISABLE_JIT` environment variable to non-zero, and then rerun the code). If the code is valid and the unsupported functionality is important to you please file a feature request at: https://github.com/numba/numba/issues/new To see Python/NumPy features supported by the latest release of Numba visit: http://numba.pydata.org/numba-doc/latest/reference/pysupported.html and http://numba.pydata.org/numba-doc/latest/reference/numpysupported.html s– Numba could not make a constant out of something that it decided should be a constant. This could well be a current limitation in Numba's internals, however please first check that your code is valid for compilation, particularly with respect to string interpolation (not supported!) and the requirement of compile time constants as arguments to exceptions: http://numba.pydata.org/numba-doc/latest/reference/pysupported.html?highlight=exceptions#constructs If the code is valid and the unsupported functionality is important to you please file a feature request at: https://github.com/numba/numba/issues/new If you think your code should work with Numba. %s s¶ This is not usually a problem with Numba itself but instead often caused by the use of unsupported features or an issue in resolving types. 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