Why is my computation so much faster in C# than Python

Question

Below is a simple piece of process coded in C# and Python respectively (for those of you curious about the process, it\'s the solution for Problem

Answer 1

Try python JIT Implementations like pypy and numba or cython if you want fast as C but sacrifice a bit of code readability.

e.g in pypy

# PyPy

number 232792560

time elapsed = 4.000000 sec.

e.g in cython

# Cython

number 232792560

time elapsed = 1.000000 sec.

Cython Source:

from datetime import datetime

cpdef void run():
    t0 = datetime.now()
    cdef int max_number = 20
    found = False
    cdef int start = max_number
    cdef int i
    while not found:
        found = True
        i = 2
        while ((i < max_number + 1) and found):
            if (start % i) != 0:
                found = False
            i += 1
        start += 1

    print("number {0:d}\n".format(start - 1))

    print("time elapsed = {0:f} sec.\n".format((datetime.now() - t0).seconds))