如何讓python在函數運行時打印出當前經過的時間？

Question

所以我目前有 python 打印一個函數在運行完成后需要多長時間運行，例如：

import time
t = time.time()
# do something in here
print "\n Time Taken: %.3f sec" % (time.time()-t)

但我想顯示自函數啟動以來已經過去的實時時間，我無法找到一種方法來實現它。

例如在終端中，我希望它說：

Working on xFunction. Time Elapsed 72.485 sec... (live updated time)
xFunction Has finished.
Time Taken: 1152.546 sec

任何幫助將不勝感激。

Answer 1

這是一個帶有線程的示例，該線程將打印自啟動以來已經過去了多少時間，並且可以從主循環中停止。

import time
import threading

class ElapsedTimeThread(threading.Thread):
    """"Stoppable thread that prints the time elapsed"""
    def __init__(self):
        super(ElapsedTimeThread, self).__init__()
        self._stop_event = threading.Event()

    def stop(self):
        self._stop_event.set()

    def stopped(self):
        return self._stop_event.is_set()

    def run(self):
        thread_start = time.time()
        while not self.stopped():
            print("\rElapsed Time {:.3f} seconds".format(time.time()-thread_start), end="")
            #include a delay here so the thread doesn't uselessly thrash the CPU
            time.sleep(0.01)

if __name__ == "__main__":
    start = time.time()
    thread = ElapsedTimeThread()
    thread.start()
    # do something
    time.sleep(5)
    # something is finished so stop the thread
    thread.stop()
    thread.join()
    print() # empty print() to output a newline
    print("Finished in {:.3f} seconds".format(time.time()-start))

這給出了以下輸出，其中Elapsed Time從零開始計數並被覆蓋：

J:\>python thr_time.py
Elapsed Time 5.000 seconds
Finished in 5.001 seconds

請注意，此代碼在 Python 3 中。有關在此處和此處停止線程的更多信息。

如果您想對任何部分進行澄清，請告訴我。

Answer 2

我修改了 @import_random 的代碼，通過包裝 2 個用於 ETC 初始化和完成的函數，能夠在代碼執行期間隨時探測經過的時間：

import time
import threading

class ElapsedTimeThread(threading.Thread):
    """"Stoppable thread that prints the time elapsed"""

    
    def __init__(self):
        super(ElapsedTimeThread, self).__init__()
        self._stop_event = threading.Event()
        self.thread_start = time.time()

    def stop(self):
        self._stop_event.set()

    def stopped(self):
        return self._stop_event.is_set()

    def getStart(self):
        return self.thread_start
    
    def getCurrentTime(self):
        print("\rElapsed Time {:.3f} s. ".format(time.time()-self.thread_start), end="", flush=True )
        
    def run(self):
        self.thread_start = time.time()
        while not self.stopped():
            print("\rElapsed Time {:.3f} s. ".format(time.time()-self.thread_start), end="", flush=True)
            #include a delay here so the thread doesn't uselessly thrash the CPU
            time.sleep(0.01)

def startTimeCounter():    
    threadTimer = ElapsedTimeThread()
    threadTimer.start()
    return threadTimer

def stopTimeCounter(threadTimeCounter):
    print() # empty print() to output a newline
    print("Finished in {:.3f} s. ".format(time.time()-threadTimeCounter.getStart()))
    threadTimeCounter.stop()
    threadTimeCounter.join()