python – 子进程子跟踪

发布时间：2020-12-20 13:13:20 所属栏目：Python 来源：网络整理

导读：我想访问在子进程中运行的 python程序的回溯. The documentation说： Exceptions raised in the child process,before the new program has started to execute,will be re-raised in the parent. Additionally,the exception object will have one extra at

我想访问在子进程中运行的 python程序的回溯.

The documentation说：

Exceptions raised in the child process,before the new program has started to execute,will be re-raised in the parent. Additionally,the exception object will have one extra attribute called child_traceback,which is a string containing traceback information from the child’s point of view.

my_sub_program.py的内容：

raise Exception("I am raised!")

my_main_program.py的内容：

import sys
import subprocess
try:
    subprocess.check_output([sys.executable,"my_sub_program.py"])
except Exception as e:
    print e.child_traceback

如果我运行my_main_program.py,我会收到以下错误：

Traceback (most recent call last):
  File "my_main_program.py",line 6,in <module>
    print e.child_traceback
AttributeError: 'CalledProcessError' object has no attribute 'child_traceback'

如何在不修改子进程程序代码的情况下访问子进程的回溯？这意味着,我想避免在我的整个子程序代码中添加一个大的try / except子句,而是处理来自我的主程序的错误记录.

编辑：sys.executable应该可以替换为与运行主程序的解释器不同的解释器.

解决方法

当您开始另一个Python进程时,您也可以尝试使用多处理Python模块;通过对Process类进行子类化,可以很容易地从目标函数中获取异常：

from multiprocessing import Process,Pipe
import traceback
import functools

class MyProcess(Process):
    def __init__(self,*args,**kwargs):
        Process.__init__(self,**kwargs)
        self._pconn,self._cconn = Pipe()
        self._exception = None

    def run(self):
        try:
            Process.run(self)
            self._cconn.send(None)
        except Exception as e:
            tb = traceback.format_exc()
            self._cconn.send((e,tb))
            # raise e  # You can still rise this exception if you need to

    @property
    def exception(self):
        if self._pconn.poll():
            self._exception = self._pconn.recv()
        return self._exception


p = MyProcess(target=functools.partial(execfile,"my_sub_program.py"))
p.start()
p.join() #wait for sub-process to end

if p.exception:
    error,traceback = p.exception
    print 'you got',traceback

诀窍是让目标函数执行Python子程序,这是通过使用functools.partial完成的.

（编辑：李大同）

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