python线程应用错误到许多参数 [英] python threading app error to many arguments

问题描述

此python源代码有什么问题?

What is wrong with this python source code?

import threading
import subprocess as sub

def ben(fil):
    pr = sub.Popen(fil,stdout=sub.PIPE,stderr=sub.PIPE)
    output, errors = pr.communicate()
    print output

theapp = '''blender
            blender-softwaregl'''.split()
print theapp

for u in theapp:
    print u
    tr = threading.Thread(target=ben, args=(u))
    tr.daemon = True
    tr.start()

错误是:

['blender', 'blender-softwaregl']
blender
Exception in thread Thread-1:
Traceback (most recent call last):
  File "/usr/local/lib/python2.7/threading.py", line 551, in __bootstrap_inner
    self.run()
  File "/usr/local/lib/python2.7/threading.py", line 504, in run
    self.__target(*self.__args, **self.__kwargs)
TypeError: ben() takes exactly 1 argument (7 given)

blender-softwaregl
Exception in thread Thread-2:
Traceback (most recent call last):
  File "/usr/local/lib/python2.7/threading.py", line 551, in __bootstrap_inner
    self.run()
  File "/usr/local/lib/python2.7/threading.py", line 504, in run
    self.__target(*self.__args, **self.__kwargs)
TypeError: ben() takes exactly 1 argument (18 given)

这是我的问题.这是什么错误?

This is my problem.What is this error?

 TypeError: ben() takes exactly 1 argument (18 given)

推荐答案

threading.Thread的args参数需要一个序列，但是您要提供一个字符串.这导致它将字符串的每个字母解释为一个单独的参数，从而导致目标函数的参数过多.

The args argument to threading.Thread expects a sequence, but you're providing a string. This is causing it to interpret each letter of the strings as an individual argument, resulting in too many arguments for your target function.

您非常接近拥有正确的代码.您只需要通过在括号中添加尾部逗号来修复元组语法:

You're very close to having the right code. You just need to fix your tuple syntax by adding a trailing comma in the parenthases:

tr = threading.Thread(target=ben, args=(u,)) # comma makes args into a 1-tuple

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