python 定时执行指定的函数

"""
作者：皮蛋编程(https://www.pidancode.com)
创建日期：2022/3/27
功能描述：
"""

import time


def print_timing(func):
    def wrapper(*arg):
        t1 = time.time()
        res = func(*arg)
        t2 = time.time()
        print('%s took %0.3f ms' % (func, (t2 - t1) * 1000.0))
        return res

    return wrapper


# declare the @ decorator just before the function, invokes print_timing()
@print_timing
def getPrimeList(n):
    """ returns a list of prime numbers from 2 to < n using a sieve algorithm"""
    if n < 2:
        return []
    if n == 2:
        return [2]
    # do only odd numbers starting at 3
    s = list(range(3, n + 1, 2))
    # n**0.5 may be slightly faster than math.sqrt(n)
    mroot = n ** 0.5
    half = len(s)
    i = 0
    m = 3
    while m <= mroot:
        if s[i]:
            j = (m * m - 3) // 2
            s[j] = 0
            while j < half:
                s[j] = 0
                j += m
        i = i + 1
        m = 2 * i + 3
    return [2] + [x for x in s if x]


if __name__ == "__main__":
    print("prime numbers from 2 to <10,000,000 using a sieve algorithm")
    primeList = getPrimeList(10000000)
    time.sleep(2.5)