Python 子进程只传递一个参数 [英] Python subprocess passes one argument only

问题描述

我有一个 Python 脚本 (2.7)，用于调用外部进程.直到最近它运行良好.

I have a Python script (2.7) which I use to invoke an external process.Till recently it worked fine.

但是现在当我运行它时，我看到它没有传递进程参数.我还调试了被调用的进程，它只接收单个参数(进程可执行文件的路径).

But now when I run it I see it doesn't pass over process arguments.I have also debugged the invoked process and it receives only the single argument (the path of the process executable).

p = subprocess.Popen(["./myapp","-p","s"],shell=True)
p.communicate()

上述代码的执行只传递了myapp"作为命令参数.为什么会发生这种情况?

Execution of the above code passes only "myapp" as the command argument.Why could that happen?

推荐答案

使用 shell=True 时，只传递一个字符串(不是列表)；

When using shell=True, just pass a string (not a list);

p = subprocess.Popen('./myapp -p s', shell=True)
p.communicate()

更新

总是喜欢；

• shell=False(默认)到 shell=True 并传递一个字符串数组；和
• 可执行文件的绝对路径，而不是相对路径.

• shell=False (the default) to shell=True and pass an array of strings; and
• an absolute path to the executable, not a relative path.

即;

with subprocess.Popen(['/path/to/binary', '-p', 's']) as proc:
    stdout, stderr = proc.communicate()

如果您只对 stdout(而不是 stderr)感兴趣，请选择上述解决方案(它更安全、更短):

If you're just interested in the stdout (and not the stderr), prefer this to the above solution (it's safer and shorter):

stdout = subprocess.check_output(['/path/to/binary', '-p', 's'])

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