Question

import shlex,subprocess,os
cmd = "/Applications/LibreOffice.app/Contents/MacOS/swriter --headless --invisible --convert-to pdf:writer_pdf_Export --outdir ~/Downloads ~/Downloads/HS303.xlsx"
#This works
os.popen(cmd)
#This doesnot work
subprocess.call(shlex.split(cmd))

子进程调用无效。这是在Mac OSX中完成的。知道为什么会这样吗？

Answer 1

问题

问题是〜/ Downloads路径。〜由shell环境扩展，当您调用subprocess.call时未启用。以下是该问题的简化演示：

>>> import shlex, subprocess, os, os.path
>>> cmd = "ls ~/Downloads"
>>> print os.popen(cmd).read()
ubuntu-11.04-desktop-i386.iso
ubuntu-11.04-server-i386.iso

>>> print subprocess.check_output(shlex.split(cmd))
ls: cannot access ~/Downloads: No such file or directory
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python2.7/subprocess.py", line 537, in check_output
    raise CalledProcessError(retcode, cmd, output=output)
subprocess.CalledProcessError: Command '['ls', '~/Downloads']' returned non-zero exit status 2

解决方案

您可以使用两种解决方案，使用os.path.expanduser展开~inthon，或使用参数subprocess.call调用subprocess.check_output / shell=True。我更喜欢使用check_output而不是call，因为它返回了命令可能产生的任何输出。以下任一解决方案都可以解决您的问题。

import shlex, subprocess, os, os.path
cmd = 'ls ' + os.path.expanduser('~/Downloads')
print subprocess.check_output(shlex.split(cmd))

cmd = 'ls ~/Downloads'
print subprocess.check_output(cmd, shell=True)

子进程调用失败

1 个答案: