Debugging Python - Python Users Berlin 14.5.2020

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The document contains notes from a presentation on debugging Python. It discusses fundamentals of debugging, tools and techniques like print statements, the debugger, and understanding tracebacks. It also covers non-technical debugging methods such as taking breaks, writing down the problem, assumptions and tried solutions, and talking through the problem with someone.

Technology

Debugging
Python
Python Users Berlin :: 14.05.2020 :: @hamatti

JuhisHi, I’m
Developer Advocate @ Futurice
Founder of Turku ❤ Frontend
@hamatti :: hamatti.org
From Helsinki, "

FUNDAMENTALS
Python Users Berlin @hamatti

FUNDAMENTALS
Python Users Berlin @hamatti
TOOLS & TECHNIQUES

NON-TECHNICAL METHODS
FUNDAMENTALS
Python Users Berlin @hamatti
TOOLS & TECHNIQUES

FUNDAMENTALS
@hamattiPython Users Berlin

STOP & BREATHE
@hamattiPython Users Berlin

REPRODUCE LOCATE
@hamattiPython Users Berlin

REPRODUCE LOCATE FIX
@hamattiPython Users Berlin

https://twitter.com/JenMsft/status/1256007715425382400/ @hamattiPython Users Berlin

FROM END TO START
@hamattiPython Users Berlin

TOOLS & TECHNIQUES
@hamattiPython Users Berlin

PRINTING TO CONSOLE
@hamattiPython Users Berlin

breakpoint
@hamattiPython Users Berlin
https://docs.python.org/3/library/pdb.html

prior to Python 3.7
@hamattiPython Users Berlin

Python debugger
@hamattiPython Users Berlin

Python debugger: list
@hamattiPython Users Berlin

Python debugger: args
@hamattiPython Users Berlin

Python debugger: next
@hamattiPython Users Berlin

Python debugger: step
@hamattiPython Users Berlin

Python debugger: continue
@hamattiPython Users Berlin

UNDERSTANDING
ERROR TRACEBACKS
@hamattiPython Users Berlin

errors
@hamattiPython Users Berlin
(screenshot from hamatti.org)

DEBUG IN IDES
@hamattiPython Users Berlin

@hamattiPython Users Berlin
(screenshot from jetbrains.com)

https://www.youtube.com/watch?v=6GDBxYm-hW4

DJANGO DEBUG TOOLBAR
@hamattiPython Users Berlin

@hamattiPython Users Berlin
(screenshot from jazzband/django-debug-toolbar)
https://django-debug-toolbar.readthedocs.io/en/latest/
Django Debug Toolbar

NON-TECHNICAL METHODS
@hamattiPython Users Berlin

1. WHAT IS THE PROBLEM?
@hamatti
WRITE DOWN
Python Users Berlin

1. WHAT IS THE PROBLEM?
2. WHAT ARE YOUR ASSUMPTIONS?
@hamatti
WRITE DOWN
Python Users Berlin

1. WHAT IS THE PROBLEM?
2. WHAT ARE YOUR ASSUMPTIONS?
3. WHAT HAVE YOU TRIED?
@hamatti
WRITE DOWN
Python Users Berlin

TAKE A BREAK
@hamattiPython Users Berlin

TALK TO
A RUBBER DUCK
@hamattiPython Users Berlin

humanetechguides.com/python-errors
@hamattiPython Users Berlin

Thanks!
juhis@futurice.com
@hamatti in Twitter
hamatti.org
@hamattiPython Users Berlin

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