在iPython笔记本中调试的正确方法是什么？ [英] What is the right way to debug in iPython notebook?

问题描述

据我所知，％debug magic可以在一个单元格内进行调试。

As I know, %debug magic can do debug within one cell.

但是，我有多个单元格的函数调用。

However, I have function calls across multiple cells.

例如，

In[1]: def fun1(a)
           def fun2(b)
               # I want to set a breakpoint for the following line #
               return do_some_thing_about(b)

       return fun2(a)

In[2]: import multiprocessing as mp
       pool=mp.Pool(processes=2)
       results=pool.map(fun1, 1.0)
       pool.close()
       pool.join

我尝试过：

1. 我试图在cell-1的第一行设置％debug。但它甚至在执行cell-2之前立即进入调试模式。

1. I tried to set %debug in the first line of cell-1. But it enter into debug mode immediately, even before executing cell-2.

我尝试在代码return do_some_thing_about（b）之前的行中添加％debug。但是代码永远运行，永不停止。

I tried to add %debug in the line right before the code "return do_some_thing_about(b)". But then the code run forever, never stopped.

在ipython笔记本中设置断点的正确方法是什么？

What is the right way to set a break point within ipython notebook?

推荐答案

使用 ipdb

通过

pip install ipdb

用法：

In[1]: def fun1(a):
   def fun2(a):
       import ipdb; ipdb.set_trace() # debugging starts here
       return do_some_thing_about(b)
   return fun2(a)
In[2]: fun1(1)

为了逐行执行 n 并使用 s 进入函数并执行退出调试提示使用 c 。

For executing line by line use n and for step into a function use s and to exit from debugging prompt use c.

有关可用命令的完整列表： https://appletree.or.kr/quick_reference_cards/Python/Python%20Debugger%20Cheatsheet.pdf

For complete list of available commands: https://appletree.or.kr/quick_reference_cards/Python/Python%20Debugger%20Cheatsheet.pdf

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