無法獲取從python運行的shell腳本的輸出

Question

我想使用不同的路徑作為參數多次運行腳本，然后查看輸出。

如果我在命令提示符下使用參數path_to_code/code1.cpp運行腳本path/lizard

path/lizard path_to_code/code1.cpp

我得到輸出-我想在多個文件上運行此腳本。

看着這個和類似的問題，我嘗試了

import os, glob

def run_command(command):
    os.system(command)    

program = '"C:/Python27/Scripts/lizard.bat "'
path = '"path_to_code/*.cpp"'
for path1 in glob.glob(path):
    command = program + path1
    run_command(command)

無輸出。

import glob, subprocess

def run_command(command):
    p = subprocess.Popen(command, stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
    out, err = p.communicate()
    print out

program = '"C:/Python27/Scripts/lizard.bat "'
path = '"path_to_code/*.cpp"'
for path1 in glob.glob(path):
    command = program + path1
    run_command(command)

無輸出。

（當然，我想遞歸遍歷目錄，但這是下一步）。

如何從腳本運行的程序獲取輸出？ 從邏輯上來說，我認為這兩個版本都應該為我提供輸出...我在做什么錯？

Answer 1

嘗試使用subprocess.check_output

它應該做你想要的。

[~] cat foo.sh
#!/bin/sh

echo "Hello World!"

[~] python2.7
Python 2.7.6 (default, Sep  9 2014, 15:04:36)
[GCC 4.2.1 Compatible Apple LLVM 6.0 (clang-600.0.39)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import subprocess
>>> foo = subprocess.check_output('./foo.sh')
>>> foo
'Hello World!\n'
>>>

所以在你的具體例子中

def run_command(command):
    return subprocess.check_output(command,stderr=subprocess.STDOUT)

Answer 2

從我看來，您忘記了在此過程中進行溝通。 嘗試

def run_command(command):
    p = subprocess.Popen(command, stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
    stdout, stderr = p.communicate()
    return iter(stdout, b'')

參見https://docs.python.org/2/library/subprocess.html?highlight=popen.communicate#subprocess.Popen.communicate

干杯

Answer 3

根據對我問題的評論，我嘗試了

program = 'C:/Python27/Scripts/lizard.bat'
...
command = [program, path1]

有效-然后我意識到引號是問題，Etan Reisner是正確的。 消除它們使它起作用。

完整的更正代碼：

import os, subprocess, fnmatch

def run_command(command):
    p = subprocess.Popen(command, stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
    out, err = p.communicate()
    print out

program = 'C:/Python27/Scripts/lizard.bat'
path = 'path_to_code'
matches = []
for root, dirs, filenames in os.walk(path):
    for filename in fnmatch.filter(filenames, '*.cpp'):
         matches.append(os.path.join(root, filename))

for path1 in matches:
    command = [program, path1]
    run_command(command)