File: condition_sum.py

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cython 3.1.6%2Bdfsg-2
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from cython.parallel import prange

def psum(n: cython.int):

    i: cython.int
    sum: cython.int = 0

    for i in prange(n, nogil=True, use_threads_if=n>1000):
        sum += i

    return sum

psum(30)        # Executed sequentially
psum(10000)     # Executed in parallel