为Popen.communicate()传递整数输入参数 [英] Pass integer input argument for Popen.communicate()

问题描述

我对python来说还很陌生，现在我迷上了某些东西.我正在使用python 2.7. 我试图在我为其编写了python脚本的shell中自动执行命令.我必须向要使用Popen.communicate(input ='2')的外壳输入一个整数值.尽管传递了输入，但它以字符串形式传递，并且子进程需要将其作为数字值传递.当我尝试将其作为数字值(如Popen.communicate(input = 2))传递时，它将引发以下错误:

I am pretty new to python and I am stuck with something now. I am using python 2.7. I am trying to automate a command in shell for which I wrote a python script. I have to input an integer value to the shell for which I am using Popen.communicate(input='2'). Though input is passed, it is passed as a string and the subprocess needs it as a numeric value. When I try to pass it as a numberic value like Popen.communicate(input=2) it throws the following error :

TypeError:"int"对象没有属性" __ getitem __ "

那么有什么方法可以将输入作为数值发送?

So is there any way to send the input as a numeric value ??

这是我使用的代码:

import sys
from subprocess import Popen, PIPE, STDOUT

cmd = ["sudo", "./sbt", "project java-examples", "run"]
proc = Popen(cmd, bufsize=4096, shell=False, stdout=PIPE, stdin=PIPE, stderr=STDOUT)

string = proc.communicate(input='2')
print string[0]
proc.stdin.close()

抱歉，我最初没有提到这一点. 我的Java应用程序有多个主类，因此编译器会询问要执行哪个类，并且每次都需要输入相同的数字，这就是我试图使其自动化的原因.当我传递字符串值时，它将引发numberformatexception.

Edit : Sorry that I didn't mentioned this at the first place. My java application has multiple main classes hence the compiler ask which class to be executed, and I need to enter the same number every time,which is why I am trying to automate it. When I am passing a string value it throws numberformatexception.

推荐答案

最后，我找到了解决方案. 很好的解决方案很简单

Finally I found the solution for this. Well the solution to this was pretty simple

当我改变

string = proc.communicate(input ='2')

string = proc.communicate(input='2')

到

string = proc.communicate(input ='2 \ n')

string = proc.communicate(input='2\n')

工作正常.

这篇关于为Popen.communicate()传递整数输入参数的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！