我怎么能算出在python中执行了多少次程序

Question

from itertools import permutations
import random
import pprint
import timeit

start_time = timeit.default_timer()
count = 0
def gird(board_size):

    print ("\n".join('# ' * inrange + 'Q ' + '# ' * (8-inrange-1)\

for inrange in board_size) + "\n\n= = new board  \n")
count+=1
coloms  = range(8)
for board_size in permutations(coloms):
    if 8 == len(set(board_size[inrange]+inrange for inrange in coloms)):
        if 8 == len(set(board_size[inrange]-inrange for inrange in coloms)):
            gird(board_size)


            elapsed = timeit.default_timer() - start_time
            print(elapsed)
            print(count)

我想知道这段代码运行了多少次，我必须测量搜索成本（迭代次数达到最小值）和已解决问题的百分比。这是一个8皇后问题。

Answer 1

  

我如何计算在python中执行了多少次程序

我能想到的唯一的方式来解决你的问题，因为你已经描述了它，而不是运行你的功能N次是这样的：

示例：

from __future__ import print_function


import atexit
from os import path
from json import dumps, loads


def read_counter():
    return loads(open("counter.json", "r").read()) + 1 if path.exists("counter.json") else 0


def write_counter():
    with open("counter.json", "w") as f:
        f.write(dumps(counter))


counter = read_counter()
atexit.register(write_counter)


def main():
    print("I have been run {} times".format(counter))


if __name__ == "__main__":
    main()

样本运行：

$ python foo.py
I have been run 1 times
$ python foo.py
I have been run 2 times
$ python foo.py
I have been run 3 times

但是我必须指出，这不是一个非常好的方法来衡量＆＃34;程序的性能或您编写的功能。您应该查看hotshot或timeit之类的内容，或者在内部多次运行您的功能并测量＆＃34;正确的事情＆＃34;。