Python線程，測量進度百分比

Question

這是一種“最佳做法”問題。 我正在做我的第一個多線程代碼，我想知道自己是否在正確地衡量進度。 這是我的代碼，它一次執行16個文件復制線程，而我正在嘗試創建一個進度條。 這段代碼有效，但是我想知道這是否是“正確”的方法（例如，如果多個線程一次寫入“ copyCount”，該怎么辦？）：

import Queue, threading, os
import shutil

fileQueue = Queue.Queue()
destPath = 'destination/folder/here'

class ThreadedCopy:
    totalFiles = 0
    copyCount = 0

    def __init__(self):
        with open("filelist.txt", "r") as txt:
            fileList = txt.read().splitlines()

        if not os.path.exists(destPath):
            os.mkdir(destPath)

        self.totalFiles = len(fileList)

        print str(self.totalFiles) + " files to copy."
        self.threadWorkerCopy(fileList)

    def CopyWorker(self):
        while True:
            fileName = fileQueue.get()
            shutil.copy(fileName, destPath)
            fileQueue.task_done()
            self.copyCount += 1
            percent = (self.copyCount*100)/self.totalFiles
            print str(percent) + " percent copied."

    def threadWorkerCopy(self, fileNameList):
        for i in range(16):
            t = threading.Thread(target=self.CopyWorker)
            t.daemon = True
            t.start()
        for fileName in fileNameList:
            fileQueue.put(fileName)
        fileQueue.join()

ThreadedCopy()

Answer 1

對於其他感興趣的人，我肯定是做錯了。 我找到了這篇奇妙的文章，它用非常簡單的術語解釋了如何使用鎖來處理多個線程： http : //effbot.org/zone/thread-synchronization.htm

對於更新的代碼示例：

import Queue, threading, os
import shutil

fileQueue = Queue.Queue()
destPath = 'destination/folder/here'

class ThreadedCopy:
    totalFiles = 0
    copyCount = 0
    lock = threading.Lock()

    def __init__(self):
        with open("filelist.txt", "r") as txt:
            fileList = txt.read().splitlines()

        if not os.path.exists(destPath):
            os.mkdir(destPath)

        self.totalFiles = len(fileList)

        print str(self.totalFiles) + " files to copy."
        self.threadWorkerCopy(fileList)

    def CopyWorker(self):
        while True:
            fileName = fileQueue.get()
            shutil.copy(fileName, destPath)
            fileQueue.task_done()
            with self.lock:
                self.copyCount += 1
                percent = (self.copyCount*100)/self.totalFiles
                print str(percent) + " percent copied."

    def threadWorkerCopy(self, fileNameList):
        for i in range(16):
            t = threading.Thread(target=self.CopyWorker)
            t.daemon = True
            t.start()
        for fileName in fileNameList:
            fileQueue.put(fileName)
        fileQueue.join()

ThreadedCopy()