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# Debugging with PDB
- `pdb` is Python's built-in debugger
- Available as a standard library
- Easy to use
- Powerful
- https://docs.python.org/3/library/pdb.html
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## A simple but broken script
- Let us first study the script
- Some useful programming principles
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%load data/broken.py
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## Debugging from IPython
- Easy to get started
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%cd data
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import broken
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broken.test_simple()
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%debug
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## `pdb` commands
- `h(elp) [command]`
- `p expression`
- `s(tep)`
- `n(ext)`
- `q(uit)`
- `l(ist) [first[, last]]`
- `c(ontinue)`
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## More pdb commands
- `w(here)`
- `d(own) [count]`
- `u(p) [count]`
- `b(reak) [([filename:]lineno | function) [, condition]]`
- `tbreak`
- `pp expression`
- `cl(ear) [filename:lineno | bpnumber [bpnumber ...]]`
- `condition bpnumber [condition]`
- `display [expression]`
- `interact`
- `run [args]`
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# Turn on auto-pdb
%pdb
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%run -d script.py
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%run -d -b20 script.py
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## Debugging from the console
- Allows one to debug a script
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# Run this on a shell
!python -m pdb broken.py
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## Adding a manual breakpoint in code
Handy when writing code and you want to inspect at that point.
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import pdb; pdb.set_trace()
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## More information
- See https://docs.python.org/3/library/pdb.html
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