python – 子进程子跟踪

概述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 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 sysimport subprocesstry:    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_tracebackAttributeError: '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,Pipeimport tracebackimport functoolsclass 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._exceptionp = MyProcess(target=functools.partial(execfile,"my_sub_program.py"))p.start()p.join() #wait for sub-process to endif 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.

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