docs/examples/tutorial/profiling_tutorial/calc_pi_2.pyx


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# cython: profile=True

def recip_square(int i):
    return 1. / i ** 2

def approx_pi(int n=10000000):
    cdef double val = 0.
    cdef int k
    for k in range(1, n + 1):
        val += recip_square(k)
    return (6 * val) ** .5