如何在python中使用線程時創建文件？

Question

看一看這段代碼：

import threading 
import time 

def my_inline_function(number): 
    #do some stuff 
    download_thread = threading.Thread(target=function_that_writes, args=number) 
    download_thread.start() 
    #continue doing stuff 
    i = 0 

    while(i < 10000): 
     print str(i) + " : Main thread" 
     time.sleep(1) 
     i = i + 1 


def function_that_writes(number): 
    i = number 

    file = open("dummy.txt", 'w') 

    while (i < 10000): 
     string = str(i) + " : child thread" 
     file.write(string) 
     time.sleep(1) 
    file.close() 

my_inline_function(5) 
function_that_writes(5) 

用幹my_inline_function()，這將啓動一個線程，而不是創建一個文件？

但是，當我直接調用function_that_writes(...)（不在線程中運行）時，它能夠創建一個文件。

爲什麼我得到這種行爲？

Answer 1

您需要提供您的參數作爲一個元組args=(number,)：

download_thread = threading.Thread(target=function_that_writes, args=(number,)) 

唯一的例外是在這裏很清楚：

Exception in thread Thread-1: 
Traceback (most recent call last): 
    File "/Users/mike/anaconda/lib/python2.7/threading.py", line 801, in __bootstrap_inner 
    self.run() 
    File "/Users/mike/anaconda/lib/python2.7/threading.py", line 754, in run 
    self.__target(*self.__args, **self.__kwargs) 
TypeError: function_that_writes() argument after * must be an iterable, not int