如何通过python子进程传递两个相同的参数？

Posted 2023-02-23

【中文标题】如何通过python子进程传递两个相同的参数？

【英文标题】：How to pass two same arguments via python subprocess?

【发布时间】：2016-12-16 13:05:59

【问题描述】：

我想在子进程调用中传递两个参数...像这样...

./buildbot sendchange --branch=poky --property=buildname:nice --property=machine:qemux86

所以我写了下面的程序...

# property_name = 'key': 'value'
y = ['--property=:'.format(key, value) for key, value in property_name.items()]
cmd = [
    './buildbot', 'sendchange',
    '--branch='.format(
        branch),
    y
]

上面的命令由子进程抛出错误！

Traceback (most recent call last):
  File "/home/iaskin/Workspace/latest/local/lib/python2.7/site-packages/django/core/handlers/exception.py", line 39, in inner
    response = get_response(request)
  File "/home/iaskin/Workspace/latest/local/lib/python2.7/site-packages/django/core/handlers/base.py", line 249, in _legacy_get_response
    response = self._get_response(request)
  File "/home/iaskin/Workspace/latest/local/lib/python2.7/site-packages/django/core/handlers/base.py", line 187, in _get_response
    response = self.process_exception_by_middleware(e, request)
  File "/home/iaskin/Workspace/latest/local/lib/python2.7/site-packages/channels/handler.py", line 227, in process_exception_by_middleware
    return super(AsgiHandler, self).process_exception_by_middleware(exception, request)
  File "/home/iaskin/Workspace/latest/local/lib/python2.7/site-packages/django/core/handlers/base.py", line 185, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "/home/iaskin/Workspace/latest/local/lib/python2.7/site-packages/django/contrib/auth/decorators.py", line 23, in _wrapped_view
    return view_func(request, *args, **kwargs)
  File "/home/iaskin/Workspace/buildsys/build_app/views.py", line 93, in home
    property_name=property_name
  File "/home/iaskin/Workspace/buildsys/build_app/helper/build_agent.py", line 50, in submit_buildbot
    output = subprocess.Popen(cmd, cwd=bb_master_dir)
  File "/usr/lib/python2.7/subprocess.py", line 711, in __init__
    errread, errwrite)
  File "/usr/lib/python2.7/subprocess.py", line 1343, in _execute_child
    raise child_exception
TypeError: execv() arg 2 must contain only strings

所以我把上面的代码改成了这个

y = ['--property=:'.format(key, value) for key, value in property_name.items()]
cmd = [
    './buildbot', 'sendchange', '--master=bsp-buildvm:9999',
    '--branch='.format(
        branch),
    "".format(' '.join(y))
]

这是我不想要的......

./buildbot sendchange --branch=poky "--property=buildname:nice --property=machine:qemux86"

那我做错了吗？还是subprocess 真的不允许这样做，那么还有其他选择吗？

【参考方案1】：

在父进程中将参数保存为环境变量。子进程可以访问它。

【讨论】：

嗨...你能解释一下吗！我需要在代码中更改什么？

os.environ['KEY'] = "my-personal-key" --- 这种类型的构造会设置一个环境变量。子进程可以继承这些环境变量。

设置好环境后，我该如何更改我的cmd 代码？

请您在回答中解释清楚！我没听懂你想说的..