停止检查是否满足条件后的语句

时间:2016-05-03 20:20:07

标签: python loops if-statement

我有以下程序运行400秒,并且在整个while循环中,它迭代一组时间码。当程序的经过运行时间与其中一个时间码相同时,它会执行某些操作。问题是它每秒钟多次迭代时间码数组,目前它在第二次“满足条件”时满足条件 - 我只想让它做一次......我怎么能这样做?

#!/usr/bin/env python3

import time

def get_sec(s):
    l = s.split(':')
    return int(l[0]) * 60 + int(l[1])

def sec_trim(s):
    l = s.split('.')
    return int(l[0])

times = [
    '00:07',
    '00:34',
    '00:59',
    '01:29',
    '02:22',
    '02:50',
    '03:05',
    '03:21',
    '04:07',
    '04:24',
    '04:58',
    '05:27',
    '06:03',
    '06:22',
    '06:36',
    '06:58',
    '07:07',
    '07:24',
    '07:45',
    '08:40',
    '08:51',
    '09:17',
    '09:31',
    '09:43',
    '10:01',
    '10:10',
    '10:30',
    '11:29',
    '11:42',
    '12:02',
    '12:14',
    '12:26',
    '12:51',
    '13:47',
    '13:58',
    '14:09',
    '14:33'
]



start_time = time.time()
elapsed_time = time.time() - start_time

while elapsed_time < 400:
    for item in times:
        elapsed_time = time.time() - start_time
        if get_sec(item) == sec_trim(str(elapsed_time)):
            print item
        # print sec_trim(str(elapsed_time))

3 个答案:

答案 0 :(得分:2)

而不是遍历整个列表:

  1. 由于列表已排序,因此只检查第一项。

  2. 一旦达到第一项中给出的时间,请从列表中弹出。

答案 1 :(得分:0)

我没有完全理解您的问题,但如果您希望每秒运行代码序列,则可以使用time.sleep('seconds')

import time
start_time = time.time()
elapsed_time = time.time() - start_time
while elapsed_time < 400:
    for item in times:
        elapsed_time = time.time() - start_time
        if get_sec(item) == sec_trim(str(elapsed_time)):
            print item
    time.sleep(1.0)

答案 2 :(得分:0)

我继续写下我在评论中提出的不同答案:

start_time = time.time()
elapsed_time = time.time() - start_time

# loop while we have times and we haven't run out of time
for next_str in times:
    if elapsed_time >= 400:
        break

    # if there's time to kill, go to sleep
    elapsed_time = time.time() - start_time
    wait_time = get_sec(next_str) - elapsed_time
    if wait_time > 0:
        time.sleep(wait_time)

    # do the thing
    print next_str
    # print sec_trim(str(elapsed_time))