如何通过Python脚本使用不同的输入运行多次相同的程序？

I need to run a simple C program several time, each one with different input string (let's say AAAAA... increasing size, until I get "TRUE" as output). e.g.

我需要多次运行一个简单的C程序，每个程序都有不同的输入字符串（让我们说AAAAA ......增加大小，直到我得到“TRUE”作为输出）。例如

./program A # output FALSE
./program AA # output FALSE
./program AAA # output FALSE
./program AAAA # output FALSE
./program AAAAA # output FALSE
./program AAAAAA # output FALSE
./program AAAAAAA  # output TRUE

in C I would simply use a while loop. I know in python there is the while loop as well.

在C中我只会使用while循环。我知道在python中也有while循环。

So the python program would be:

所以python程序将是：

strlen = 0
while TRUE
 strlen++
 <run ./**C program** "A"*strlen > 
 if (<program_output> = TRUE)
   break

Given that I can make the .py script executable by writing

鉴于我可以通过编写使.py脚本可执行

#! /usr/bin/env python

and

和

 chmod +x file.py

What should I do to make this work?

我应该怎么做才能使这项工作？

Thanks in advance

提前致谢

4 个解决方案

#1

You could try something like this (see docs):

你可以试试这样的东西（见文档）：

import subprocess

args = ""
while True:
     args += "A"
     result = subprocess.call(["./program", "{args}".format(args=args)])
     if result == 'TRUE':
         break

The subprocess module is preferred to the os.popen command, since it has been "deprecated since version 2.6." See the os documentation.

子进程模块优先于os.popen命令，因为它自“2.6版本以来已被弃用”。请参阅os文档。

#2

You can use subprocess.check_output:

您可以使用subprocess.check_output：

import subprocess
strlen = 0
while True:
    strlen += 1
    if subprocess.check_output(['./program', 'A'*strlen]) == 'TRUE':
        break

#3

file.py

file.py

import os

count=10
input="A"
for i in range(0, count):
    input_args=input_args+input_args
    os.popen("./program "+input_args)

running file.py would execute ./program 10 times with increasing A input

运行file.py会在增加A输入的情况下执行./program 10次

#4

Use commands. Here is the documentation http://docs.python.org/2/library/commands.html

使用命令。这是文档http://docs.python.org/2/library/commands.html

commands.getstatusoutput returns a stdout output from your C program. So, if your program prints something, use that. (In fact, it returns a tuple (0, out) for stdout).
commands.getstatusoutput返回C程序的stdout输出。所以，如果您的程序打印出来，请使用它。（实际上，它为stdout返回一个元组（0，out））。
commands.getstatus returns boolean status from program which you can use as well.
commands.getstatus从程序中返回布尔状态，您也可以使用它。

So, assuming you are using stdout to capture the ./program output, the entire modified program looks like

因此，假设您使用stdout捕获./program输出，整个修改过的程序看起来像

import commands

while TRUE:
  strlen += 1
  output = commands.getstatusoutput("./program " + "A"*strlen)
  outstatus = output[1]
  if output == "true":
     break

I would experiment with getstatus to see if I can read values returned by program.

我会尝试使用getstatus来查看是否可以读取程序返回的值。

Edit: Didn't notice that commands is deprecated since 2.6 Please use subprocess as shown in other response.

编辑：自2.6以来没有注意到命令已被弃用请使用其他响应中显示的子进程。

#1