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When designing a Python—C interface, it is important to carefully consider on which side to allocate arrays: arrays can be allocated either on the Python side and passed to the C(++) implementation, or they can be allocated on the C(++) implementation that returns a pointer. The latter approach is convenient for situations where the buffer sizes are a priori not known. However, returning pointers to arrays allocated C(++)-side can be problematic since it can lead to memory leaks due to Python garbage collection, which does not "see" the allocated arrays. We recommend to design the C API such that arrays can be allocated outside and passed to the C implementation. These arrays can then be allocated within __init__.py, as in this ...