So you think you can pdb?

So You Think You Can PDB?Clayton Parker - PyOhio 2014

So You Think You Can PDB? - Clayton Parker - PyOhio 2014

Who am I?Director of Development at Six Feet Upclaytron on the internets


What is PDB?Interactive debugging toolPure awesome


How to invoke it?Set a trace directly in the code:

import pdb; pdb.set_trace()

Or start a script with pdb directly:

$ python -m pdb example.py

It is that easy!


Now what?Common commandsNavigating the stack


HelpType help or ? for short to know what commands are available

Further help on commands help help or help list


Show the current contextType list or l to see the current position in the code


Repeating the last commandJust type return


Examine variablesType print or p to see what a variable is set to

Use pp to pretty print the result for easier reading


Go to the next lineType next or n to go to the next line


Step into a functionType step or s to step into a function for further inspection


Skip over a loopType until or u to skip over the end of a loop


Skip to the end of a functionType return or r to go to the end of a function


BreakpointsType break or b to see a list of breakpoints

Then b and a line number to set one

To clear out a breakpoint clear or cl and a breakpoint number


Continue executionType continue or c to go to the next breakpoint or finishexecution


Conditional breakpointsBreakpoints can take an expression to know when to break:

b 11, this_year == 2014


See where you are in thestackType where or w to see the current stack

You can debug at any point in the stack


Traverse the stackType up or u to go up the stackType down or d to go back down the stack


New features in Python 3:InteractType interact to open an interpreter in the current scope


New features in Python 3:Long listType longlist or ll to show the complete current function


All doneType quit or q to exit pdb and stop execution


PDB AlternativesPDB++ipdbrpdb / remote-pdb


HelpersPdbSublimeTextSupportvimpdbflake8-debugger


.pdbrcPersonalize your experience

Set up aliases / custom mappingsEnhance with readline support


LinksPython Module of the Week: PDBIn Depth PDB - Nathan Yergler


So you think you can pdb?

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