Cython

A Python superset that compiles to C — add types to make hot loops run at C speed and call C libraries.

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def total(double[:] a):
    cdef double s = 0
    cdef Py_ssize_t i
    for i in range(a.shape[0]):
        s += a[i]
    return s

Used inside SciPy, pandas and scikit-learn.

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