使用PyCharm调试Popen子流程 [英] Debugging Popen subprocesses with PyCharm

问题描述

我正在尝试调试使用psutil.Popen对象的Python应用程序.当我启动一个子进程时，PyCharm用以下命令替换我的命令行:

I'm trying to debug a Python application that uses psutil.Popen objects. When I start a subprocess, PyCharm replaces my command line with the following:

python -m pydevd.py --multiproc --client 127.0.0.1 --port 52581 --file <myapplication>

最终会导致错误:

python.exe: Import by filename is not supported.

当我启动不带-m选项的相同命令时，一切似乎都很好.有什么方法可以更改PyCharm的调试器启动命令?

When I launch the same command without -m option, everything seems to be fine. Is there a way I can change PyCharm's debugger launch command?

我已更新到PyCharm Community Edition 4.0.3，新的调试器命令如下:

I've updated to PyCharm Community Edition 4.0.3 and the new debugger command looks like:

python.exe "C:\Program Files (x86)\JetBrains\PyCharm Community Edition 4.0.3\helpers\pydev\pydevd.py" 
--multiproc --client 127.0.0.1 --port 62661 
--file __main__.py local -c local.yml -f input/11_12.xls

其中，-c和-f是模块的命令行参数.调试器启动命令已更改，但是并不能解决问题.我仍然收到Import by filename is not supported错误.

where -c and -f are my module's command line arguments. The debugger launch command has changed, but it didn't solve the issue; I still get the Import by filename is not supported error.

此处位于Bitbucket.org 处提供了代码示例. Pycharm的运行配置应如下所示:

A code example is available here at Bitbucket.org. Pycharm's run configuration should look like:

Script:            __main__.py
Script parameters: server
Working directory: %path to the repository%

推荐答案

如Piotr所述，PyCharm'在调试时自动附加到子进程'.如果子进程是Python进程，则PyCharm调试器会更改该进程的启动参数(请参见函数patch_args，位于

As Piotr mentioned, PyCharm 'Attach to subprocess automatically while debugging'. If subprocess is a Python process, PyCharm debugger change the process's startup arguments (see function patch_args at source). When you start subprocess in this way:

args = ['python',
        '-m', 'pycharm-multiprocess-debug',
        'worker']
worker = subprocess.Popen(args)

实际的启动命令如下:

python.exe -m "C:\Program Files (x86)\JetBrains\PyCharm Community Edition 4.0.3\helpers\pydev\pydevd.py"
--multiproc --client 127.0.0.1 --port 62661
--file pycharm-multiprocess-debug

所以它出了错.我可以找到几种解决方法:

So it went wrong. There are several workarounds I can find:

1. 最简单的方法，如果您不需要调试子流程，只需在PyCharm设置中关闭调试时自动附加到子流程"

1. easiest way, if you don't need to debug subprocess, just turn off "Attach to subprocess automatically while debugging" inside PyCharm settings

将您的args更改为:

change your args to:

args = ['python', '__main__.py', 'worker']

缺点是您只能运行Python文件，而不能运行Python模块.

The disadvantage is you can only run a Python file, not a Python module.

我建议使用Python子进程的最后一个解决方案:

I recommend the last solution for Python subprocess:

from multiprocessing import Process

def server():
    p = Process(target=worker)
    p.start()
    print 'worker pid: {}'.format(p.pid)
    p.join()

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