What is the right way to debug in iPython notebook

Question

As I know   debug magic can do debug within one cell   However  I have function calls across multiple cells   For example   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   What I tried         I tried to set  debug in the first line of cell-1  But it enter into debug mode immediately  even before executing cell-2    I tried to add  debug in the line right before the code return do some thing about b   But then the code runs forever  never stops    What is the right way to set a break point within the ipython notebook

User · Answer

I just discovered PixieDebugger  Even thought I have not yet had the time to test it  it really seems the most similar way to debug the way we re used in ipython with ipdb  It also has an  quot evaluate quot   tab

User · Answer

Just type import pdb in jupyter notebook  and then use this cheatsheet to debug  It s very convenient   c --  continue  s --  step  b 12 --  set break point at line 12 and so on      Some useful links    Python Official Document on pdb  Python pdb debugger examples for better understanding how to use the debugger commands       Some useful screenshots

User · Answer

Your return function is in line of def function main function   you must give one tab to it  And Use     debug    instead of   debug    to debug the whole cell not only line  Hope  maybe this will help you

User · Answer

Use ipdb   Install it via   pip install ipdb   Usage    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    For executing line by line use n and for step into a function use s and to exit from debugging prompt use c   For complete list of available commands  https   appletree or kr quick reference cards Python Python 20Debugger 20Cheatsheet pdf

User · Answer

You can always add this in any cell   import pdb  pdb set trace     and the debugger will stop on that line   For example   In 1   def fun1 a              def fun2 a                  import pdb  pdb set trace     debugging starts here            return fun2 a   In 2   fun1 1

User · Answer

In Python 3 7 you can use breakpoint   function  Just enter   breakpoint     wherever you would like runtime to stop and from there you can use the same pdb commands  r  c  n       or evaluate your variables

User · Answer

You can use ipdb inside jupyter with   from IPython core debugger import Tracer  Tracer         Edit  the functions above are deprecated since IPython 5 1  This is the new approach   from IPython core debugger import set trace   Add set trace   where you need a breakpoint  Type help for ipdb commands when the input field appears

User · Answer

The  pdb magic command is good to use as well  Just say  pdb on and subsequently the pdb debugger will run on all exceptions  no matter how deep in the call stack  Very handy   If you have a particular line that you want to debug  just raise an exception there  often you already are   or use the  debug magic command that other folks have been suggesting

User · Answer

A native debugger is being made available as an extension to JupyterLab  Released a few weeks ago  this can be installed by getting the relevant extension  as well as xeus-python kernel  which notably comes without the magics well-known to ipykernel users    jupyter labextension install  jupyterlab debugger conda install xeus-python -c conda-forge   This enables a visual debugging experience well-known from other IDEs     Source  A visual debugger for Jupyter

User · Answer

After you get an error  in the next cell just run  debug and that s it

[python] What is the right way to debug in iPython notebook?

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