python3多线程写入文件

编程问答 2022-08-23

问题描述

嗨，我目前是多线程技术的新手，正在尝试解决此问题：

  • 具有75个元素的列表
  • 写入列表中不超过10个元素的8个文件（例如：file1-从索引0到9，文件2-从索引10到19，...，文件8-从索引70到74） / li>
  • 使用5个线程来处理，每个线程处理一个单独的文件写入，一个线程将处理1个以上的文件

一开始我只是尝试使用线程进行打印：

import threading
a = list(range(75))

class myThread(threading.Thread):
    def __init__(self,threadID,name,file_number):
        threading.Thread.__init__(self)
        self.threadID = threadID
        self.name = name
        self.file_number = file_number

    def run(self):
        print("Starting " + self.name)
        print_time(self.name,self.file_number)
        print("Exiting " + self.name)

def print_time(threadName,file_number):
  render_list = a[:10]
  print("%s: %s" % (threadName,render_list))
  del a[:10]


# Create new threads
thread1 = myThread(1,"Thread-1",1)
thread2 = myThread(2,"Thread-2",2)
thread3 = myThread(3,"Thread-3",3)
thread4 = myThread(4,"Thread-4",4)
thread5 = myThread(5,"Thread-5",5)
thread6 = myThread(5,6)
thread7 = myThread(5,7)
thread8 = myThread(5,8)

# Start new Threads
thread1.start()
thread2.start()
thread3.start()
thread4.start()
thread5.start()
thread6.start()
thread7.start()
thread8.start()
thread1.join()
thread2.join()
thread3.join()
thread4.join()
thread5.join()
thread6.join()
thread7.join()
thread8.join()
print("Exiting Main Thread")

它完美打印出来：

Starting Thread-1
Thread-1: [0,1,2,3,4,5,6,7,8,9]
Exiting Thread-1
Starting Thread-2
Thread-2: [10,11,12,13,14,15,16,17,18,19]
Exiting Thread-2
Starting Thread-3
Thread-3: [20,21,22,23,24,25,26,27,28,29]
Exiting Thread-3
Starting Thread-4
Thread-4: [30,31,32,33,34,35,36,37,38,39]
Exiting Thread-4
Starting Thread-5
Thread-5: [40,41,42,43,44,45,46,47,48,49]
Exiting Thread-5
Starting Thread-5
Thread-5: [50,51,52,53,54,55,56,57,58,59]
Exiting Thread-5
Starting Thread-5
Thread-5: [60,61,62,63,64,65,66,67,68,69]
Exiting Thread-5
Starting Thread-5
Thread-5: [70,71,72,73,74]
Exiting Thread-5
Exiting Main Thread

但是当我尝试写入文件时：

import threading
a = list(range(75))

class myThread(threading.Thread):
    def __init__(self,file_number):
  render_list = a[:10]
  f = open("demofile_%s.txt" % file_number,"a")
  for i in render_list:
    f.write("%s\n" % i)
  f.close()
  print("%s: %s" % (threadName,8)

# Start new Threads
thread1.start()
thread2.start()
thread3.start()
thread4.start()
thread5.start()
thread6.start()
thread7.start()
thread8.start()
thread1.join()
thread2.join()
thread3.join()
thread4.join()
thread5.join()
thread6.join()
thread7.join()
thread8.join()
print("Exiting Main Thread")

我文件中的内容是错误的，并且重复了以下打印内容：

Starting Thread-1
Starting Thread-2
Starting Thread-3
Starting Thread-4
Thread-1: [0,9]
Exiting Thread-1
Thread-3: [0,9]
Exiting Thread-3
Thread-4: [0,9]
Exiting Thread-4
Starting Thread-5
Thread-2: [0,9]
Starting Thread-5
Thread-5: [30,39]
Exiting Thread-2
Exiting Thread-5
Thread-5: [30,39]
Starting Thread-5
Exiting Thread-5
Starting Thread-5
Thread-5: [60,69]
Thread-5: [60,69]
Exiting Thread-5
Exiting Thread-5
Exiting Main Thread

似乎该线程未按打印顺序运行

希望有人可以帮助我解决问题

解决方法

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multithreadingpythonpython-3.x