Debug python Script with pdb

Usage

Launch

to debug a script, you can run

python -m script_to_debug.py arguments

The program will break in the first line of the script. pdb will automatically enter post-mortem debug and restart

Insert Statment to Break the Running Script

import pdb;pdb.set_trace()

if you want to suspend on exception in pdb, try post_mortem method

import pdb;pdb.post_mortem()

Configure

.pdbrc locates home folder or current folder
aliases is in this file

to include py script into my.pdbrc, use execfile() to run a file containing your Python code.

.pdbrc

alias p_ for k in sorted(%1.keys()): print "%s%-15s= %-80.80s" % ("%2",k,repr(%1[k]))

alias pi p_ %1.__dict__ %1.

alias ps pi self

alias pl p_ locals() local:

alias nl n;;l
alias sl s;;l

execfile(".pdbrc.py")

pdbrc.py

in the same directory as the .pdbrc

print ".pdbrc.py"

Command

Arguments to commands must be separated by whitespace
multiple commands may be entered on a single, sparated by ;;

Help

• h(elp) [command]

Stack Frames

• w(here)
• d(own)
• u(p)

Breakpoints

• b(reak) [filename:]:lineno | function[, condition]]
  without argument, list all breaks
• tbreak [filename:]:lineno | function[, condition]]
• cl(ear) [filename:]:lineno | function[, condition]]
• disable [bpnumber [bpnumber ...]]
• enable [bpnumber [bpnumber ...]]
• ignore bpnumber [count]
• condition bpnumber [condition]
• commands [bpnumber]

Evaluation

• s(tep)
• n(ext)
• unt(il)
• r(eturn)
• c(ont(inue))
• j(ump) lineno

View

• l(ist) [first[, last]]
• a(rgs)
• p expression

Macro

• alias [name [command]]
• unalias name

PDB Source Code

Three main classes in this module, the pdb uses the modules bdb and cmd.

• cdb.py
• cmd.py
• pdb.py

Bibliography

https://nedbatchelder.com/blog/200704/my_pdbrc.html
https://wiki.python.org/moin/PdbRcIdea
https://stackoverflow.com/questions/44155444/how-to-write-a-working-pdbrc-file
https://docs.python.org/2/library/pdb.html https://stackoverflow.com/questions/45446944/suspend-on-exception-in-pdb