Python 2.7 subprocess returns 没有，确切的命令在控制台中有效

Question

我正在尝试在 Python 脚本中执行 strings 命令。我让它工作了一段时间，但奇怪的是，当我再使用 subprocess.Popen 时，它 return 没有任何作用。

从终端调用

strings /path/to/.bashrc
# You may uncomment the following lines if you want `ls' to be colorized:
# export LS_OPTIONS='--color=auto'
# eval `dircolors`
# alias ls='ls $LS_OPTIONS'
# alias ll='ls $LS_OPTIONS -l'
# alias l='ls $LS_OPTIONS -lA'
# Some more alias to avoid making mistakes:
# alias rm='rm -i'
# alias cp='cp -i'
# alias mv='mv -i'
shopt -u -o history

在Python shell:

import subprocess
proc = subprocess.Popen(['strings', '/path/to/.bashrc'], stdout=subprocess.PIPE, stderr=subprocess.PIPE, shell=True)
out, err = proc.communicate()

第二个return没什么。为什么？

Answer 1

来自subprocess documentation：

The shell argument (which defaults to False) specifies whether to use the shell as the program to execute. If shell is True, it is recommended to pass args as a string rather than as a sequence.

尝试使用：

proc = subprocess.Popen("strings /path/to/file", ...)

Python 2.7 subprocess returns 没有，确切的命令在控制台中有效

Python 2.7 subprocess returns nothing, exact command works in console

python

console

subprocess

python-2.7