如何将python自我对象传递给另一个python脚本

ocwirk 发表于 Dev

鹰嘴豆

我有一个奇怪的要求，我需要使用子进程模块从python调用脚本，然后从脚本调用原始类的函数。我有这样的东西-

import subprocess
import textwrap
import sys
class caller:
  def call_script(self):
     script = textwrap.dedent("""\
          #! /usr/bin/env python
          import caller
          print ("Before the callback")
          caller().callback()
          print ("After the callback")
      """)
     subprocess.Popen(script, shell=True, executable=sys.executable())

   def callback(self):
      print("inside the callback")

当然，现在我意识到，将从脚本调用的回调不是执行脚本的同一对象的方法。有什么方法可以将self对象传递给脚本，或者有其他方法可以获取调用脚本的原始对象的回调方法？

鹰嘴豆

就像@knitti所建议的那样，脚本可以在完全不同的过程中运行，因此我通过组合信号，文件和全局变量解决了此问题。并不是说这是最优雅的解决方案，但它对我有用-

import subprocess, textwrap, os, signal
caller_object = None
def signal_handler(signum, frame):
   caller_object.callback()

comm_file = "/tmp/somefile"

class caller:
   def call_script(self):
     signal.signal(signal.SIGALRM, mockproc_callback)
     # Need to pass the process id to the script.
     with open(comm_file, 'w') as pipe:
        pipe.write("{0}".format(os.getpid()))

     # Also set the global object so that callback function could be called by handler
      global caller_object
      caller_object = self

     script = textwrap.dedent("""\
          #! /usr/bin/env python
          import caller, signal, os
          with open("{0}", "r") as pipe:
          # Read the pid of original process
          pid = pipe.read()
          print ("Before the callback")

          # Although its named kill, os.kill could be used to send all sort of signals to a process
          os.kill(int(pid), signal.SIGALRM)
          print ("After the callback")
      """.format(comm_file))
     subprocess.Popen(script, shell=True, executable=sys.executable())

   def callback(self):
      print("inside the callback")