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2017 - Peter Hadlaw - Intro to pdb
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PyBay
August 13, 2017
Programming
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2017 - Peter Hadlaw - Intro to pdb
PyBay
August 13, 2017
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Transcript
INTRO TO pdb Peter Hadlaw @ Tesorio August 13, 2017
https://www.tesorio.com/careers
TOO OFTEN I SEE... print foo print foo['bar'] print fizz.buzz()
...
CONS: Limited (can't interrupt execution) Messy (lot's of clean up)
Zero interactivity (need to modify code and run everything again) Much harder to dive deeper into third party code (internal or external alike)
DEBUGGER Exist in many languages and platforms Python's built-in debugger
is... "A computer program that assists in the detection and correction of errors in computer programs."
pdb
THREE EASY STEPS 1. Set a breakpoint 2. Run program
3. Execution halts at breakpoint and now, you, interact
SETTING A BREAKPOINT import pdb; pdb.set_trace() Using a one liner
is a nice habit to make clean up easier (e.g. a single dd in vi).
api.py
RUN PROGRAM
l - LIST COMMAND
EXPRESSIONS
n - NEXT COMMAND
s - STEP COMMAND
c - CONTINUE COMMAND
GENERAL FLOW Use l to orient yourself and inspect what
code is currently being executed. Use n to step forward in execution Use s to dive deeper Create expressions for the debugger to evaluate and gain insights into what's happening c to continue execution until next breakpoint / finish Profit.
NOTES More commands and features available iPython version, much more
powerful (has to be installed separately) Other languages have debuggers to, for example JavaScript in the browser, or C (gdb)
WE'RE HIRING https://www.tesorio.com/careers