随时随地在Python中翻译成口译 [英] Drop into an Interpreter anytime in Python

问题描述

我知道如何使用 pdb 和 IPython 下载到一个解释器，但这需要事先准确知道哪里我想停下来然而，我经常运行数字捣蛋脚本，需要几分钟到几个小时，我想知道它的进步是什么。一个解决方案是简单地将大量的日志记录语句放在任何地方，但是我或者淹没了太多的信息，或者无法正确记录我想知道的内容。

I know how to drop into an interpreter with pdb and IPython, but this requires me knowing beforehand exactly where I want to stop. However, I often run number crunching scripts that take minutes to hours, and I would like to know exactly what it's progress is. One solution is to simply put lots of logging statements everywhere, but then I either inundate myself with too much information or fail to log exactly what I want to know.

是否有一种初始化监听器循环的方法，在一些关键组合下，我会将代码放在当前的代码中？认为CTRL + Z，但让我在Python而不是Bash。

Is there a way to initialize a listener loop that under some key combination will drop me into the code wherever it currently is? Think CTRL+Z but leaving me in Python rather than Bash.

推荐答案

您可以使用信号模块来设置一个处理程序，当您击中control-C或control-Z或任何...时，将启动调试器。SIGINTR， SIGSUSP。

You can use the signal module to setup a handler that will launch the debugger when you hit control-C or control-Z or whatever.. SIGINTR, SIGSUSP.

例如，定义一个模块 instant_debug.py ，覆盖SIGQUIT，

For example, define a module instant_debug.py that overrides SIGQUIT,

import signal
import pdb

def handler(signum, frame):
  pdb.set_trace()

signal.signal(signal.SIGQUIT, handler)

然后make a脚本

import instant_debug
import time

for i in xrange(1000000):
  print i
  time.sleep(0.1)

在执行过程中，您可以通过键入 CTRL + \ 跳转到代码中，使用 u 和 d 如正常 pdb ，然后继续 c ，好像没有发生任何事情。请注意，您只能在下一个原子操作结束时跳入 - 这意味着在一个巨大的C模块中间不会停止。

At any point during execution, you can jump into the code by typing CTRL+\, examine the stack with u and d as in normal pdb, then continue with c as if nothing ever happened. Note that you will only jump in at the end of the next "atomic" operation -- that means no stopping in the middle of a giant C module.

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