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问答- 问题:Python-从多个线程追加到同一文件

Python-从多个线程追加到同一文件

Python-从多个线程追加到同一文件

解决方案是仅在一个线程中写入文件。

import Queue  # or queue in Python 3
import threading

class PrintThread(threading.Thread):
    def __init__(self, queue):
        threading.Thread.__init__(self)
        self.queue = queue

    def printfiles(self, p):
        for path, dirs, files in os.walk(p):
            for f in files:
                print(f, file=output)

    def run(self):
        while True:
            result = self.queue.get()
            self.printfiles(result)
            self.queue.task_done()

class ProcessThread(threading.Thread):
    def __init__(self, in_queue, out_queue):
        threading.Thread.__init__(self)
        self.in_queue = in_queue
        self.out_queue = out_queue

    def run(self):
        while True:
            path = self.in_queue.get()
            result = self.process(path)
            self.out_queue.put(result)
            self.in_queue.task_done()

    def process(self, path):
        # Do the processing job here

pathqueue = Queue.Queue()
resultqueue = Queue.Queue()
paths = getThisFromSomeWhere()

output = codecs.open('file', 'a')

# spawn threads to process
for i in range(0, 5):
    t = ProcessThread(pathqueue, resultqueue)
    t.setDaemon(True)
    t.start()

# spawn threads to print
t = PrintThread(resultqueue)
t.setDaemon(True)
t.start()

# add paths to queue
for path in paths:
    pathqueue.put(path)

# wait for queue to get empty
pathqueue.join()
resultqueue.join()
python 2022/1/1 18:47:37 有335人围观

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