如何在不使用时间模块的情况下检查每秒的迭代次数？

Question

I would like to check how many iterations are completed per second or how many urllib requests are sent per second, but without slowing down the program at all (which time.sleep() seems to do). This is the program, for example:

while True:
    url = urllib.request.urlopen("google.com")

I would also like for the requests/per second counter to update in miliseconds, so it may print something like

"2.83 requests per second" and then update to "2.93 requests per second" if the loop iterates faster.

Answer 1

I'd use time and a counter to accomplish this. I also added a custom generator (because I couldn't find one within Python's libraries) that allows you to both set and access the i value.

import time, itertools

def byRefCount():
    i = [0]
    while True:
        yield i[0],i
        i[0] += 1

last = time.time()
for i,ref in byRefCount():
    url = urllib.request.urlopen("google.com")

    if time() - last > 1:
        print(i / (time.time()-last))
        ref[0] = 0
        last = time.time()