Emacs：调试python的方法 [英] Emacs: methods for debugging python

问题描述

我发布在 programmers.stackexchange.com 上，但我认为在SO上可能更合适。

我使用emacs来处理我所有的代码编辑需求。通常，我将使用Mx编译来运行我的测试运行器，我会说，让我约70％的我需要做的，以保持代码的轨道，但最近我一直在想知道如何可能使用Mx pdb在这种情况下，打破断点和检查事情是很好的。

在我的谷歌搜索中，我发现某些事情，表明这是有用的/可能的。然而，我并没有设法让我完全理解它的工作。

我不知道这是否是buildout + appengine的组合，可能会使其变得更加困难，但是当我尝试像

  Mx pdb 
运行pdb（像这样）：/ Users / twillis / projects / hydrant / bin / python / Users / twillis / bin / pdb / users / twillis / projects / hydrant / bin / devappserver / Users / twillis / projects / hydrant / parts / hydrant-app / 
  

其中... / bin / python是解释器buildout，用于为所有的鸡蛋设置路径。

〜/ bin / pdb是简单的脚本调用pdb.main使用当前的python解释器

  HellooKitty：消防栓twillis $ cat〜/ bin / pdb 
＃！ / usr / bin / env python 
 
如果__name__ ==__main__：
 import sys 
 sys.version_info 
 import pdb 
 pdb.main ）
 HellooKitty：消防栓twillis $ 
  

... / bin / devappserver是dev_appserver脚本这个建筑配方使gae项目和... / parts / hydrant-app是app.yaml的路径

我首先提供了一个提示

p>

 当前目录是/ Users / twillis / bin / 
 Cc Cf 
  / pre> 
 
 
没有任何事情发生，但
  HellooKitty：消防栓twillis $ ps aux | grep pdb 
 twillis 469 100.0 1.6 168488 67188 s002 Rs + 1:03 PM 0：52.19 /usr/local/bin/python2.5 / Users / twillis / projects / hydrant / bin / python / Users / twillis / bin / pdb / users / twillis / projects / hydrant / bin / devappserver / Users / twillis / projects / hydrant / parts / hydrant-app / 
 twillis 477 0.0 0.0 2435120 420 s000 R + 1:05 PM 0：00.00 grep pdb 
 HellooKitty：消防栓twillis $ 
  
某些事情正在发生
  Cx [空格] 
  
将报告断点已经设定但我无法让事情发生。 
 
 
 
感觉我在这里缺少一些明显的东西。我是吗
 
 
 
那么，emacs中的交互式调试是否值得？是否可以互动调试google appengine应用程序？任何关于我如何得到这个工作的建议？
解决方案
 GAE的一个具体问题是将STDOUT重定向到浏览器，包括调试器输出。
 
 
 
如 pdb文档，通常的工作流程是在您需要的时候在代码中设置断点。通常你会做 import pdb; pdb.set_trace（），但在GAE的情况下，您还需要抓住您的STDIN和STDOUT。例如，此代码片段：
  def set_trace（）：
 import pdb，sys 
 debugger = pdb.Pdb（stdin = sys .__ stdin__，
 stdout = sys .__ stdout__）
 debugger.set_trace（sys._getframe（）。f_back）
  
然后在emacs中启动shell，然后从中运行代码：
  $ ./bin/devappserver / Users / twillis / projects / hydrant / parts / hydrant-app / 
  
为了方便地访问Emacs中shell交互缓冲区中的正确位置，我使用poptoshell.el（google，我没有足够的声誉来添加另一个链接）
 
 
 
最后，确保你有一个最新版本的python模式，以便它包括pdbtrack功能（你几乎肯定会，但你绝对想要它，因为它提供了在emacs中逐步执行代码的手段） / p> 
I posted this on programmers.stackexchange.com, but I figured it may be more appropriate on SO. 

I use emacs for all my code edit needs. Typically, I will use M-x compile to run my test runner which I would say gets me about 70% of what I need to do to keep the code on track however lately I've been wondering how it might be possible to use M-x pdb on occasions where it would be nice to hit a breakpoint and inspect things.

In my googling I've found some things that suggest that this is useful/possible. However I have not managed to get it working in a way that I fully understand. 

I don't know if it's the combination of buildout + appengine that might be making it more difficult but when I try to do something like 
M-x pdb
Run pdb (like this): /Users/twillis/projects/hydrant/bin/python /Users/twillis/bin/pdb /Users/twillis/projects/hydrant/bin/devappserver /Users/twillis/projects/hydrant/parts/hydrant-app/
Where .../bin/python is the interpreter buildout makes with the path set for all the eggs.

~/bin/pdb is a simple script to call into pdb.main using the current python interpreter
HellooKitty:hydrant twillis$ cat ~/bin/pdb
#! /usr/bin/env python

if __name__ == "__main__":
    import sys
    sys.version_info
    import pdb
    pdb.main()
HellooKitty:hydrant twillis$ 
.../bin/devappserver is the dev_appserver script that the buildout recipe makes for gae project and .../parts/hydrant-app is the path to the app.yaml

I am first presented with a prompt
Current directory is /Users/twillis/bin/
C-c C-f
Nothing happens but 
HellooKitty:hydrant twillis$ ps aux | grep pdb
twillis    469 100.0  1.6   168488  67188 s002  Rs+   1:03PM   0:52.19 /usr/local/bin/python2.5 /Users/twillis/projects/hydrant/bin/python /Users/twillis/bin/pdb /Users/twillis/projects/hydrant/bin/devappserver /Users/twillis/projects/hydrant/parts/hydrant-app/
twillis    477   0.0  0.0  2435120    420 s000  R+    1:05PM   0:00.00 grep pdb
HellooKitty:hydrant twillis$ 
something is happening
C-x [space]
will report that a breakpoint has been set. But I can't manage to get get things going. 

It feels like I am missing something obvious here. Am I? 

So, is interactive debugging in emacs worthwhile? is interactive debugging a google appengine app possible? Any suggestions on how I might get this working?
解决方案
A specific problem with GAE is that it redirects STDOUT to the browser, including debugger output.

As outlined in the pdb documentation, the usual workflow is to set a breakpoint in code at the point you need it.  Normally you'd do import pdb; pdb.set_trace(), but in the case of GAE, you'll also want to grab your STDIN and STDOUT.  For example, this code snippet:
def set_trace():
    import pdb, sys
    debugger = pdb.Pdb(stdin=sys.__stdin__, 
        stdout=sys.__stdout__)
    debugger.set_trace(sys._getframe().f_back)
Then start a shell in emacs and run your code from there:
$ ./bin/devappserver /Users/twillis/projects/hydrant/parts/hydrant-app/
For easy access to the right place in a shell-interaction buffer in emacs, I use poptoshell.el (google it, I don't have sufficient reputation to add another link)

Finally, make sure you have a recent enough version of python-mode such that it includes pdbtrack functionality (you almost certainly do, but you definitely want it, as it provides the means to step through code in emacs).

                        
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