A colleague recently asked this:
Is there a cleaner way to dump a trace/track of running a python script.
With Pydb I made work-around with
import pydb
pydb.debugger(dbg_cmds=['bt', 'l', 's']*300 + ['c'])
So now I have a dump of 300 steps with backtraces, so I can easily
compare two executions of the same script to find where they diverged. I
think it is a really nice feature.
pydb and pdb inherit from the cmd module which does allow pre- and
post-command hooks.
Neither pdb nor pydb make it easy to add one's own hook. However
If there's something you want to run before stepping you can do that
by monkey-patching Pdb.precmd:
#################### snip
import pydb
def myprecmd(obj, debug_cmd):
"""Custom Hook method executed before issuing a debugger command."""
global _pydb_trace
obj.do_list('')
obj.do_where('10') # limit stack to at most 10 entries
return obj.old_precmd(debug_cmd) # is always string 's' in example below
_pydb_trace = pydb.Pdb()
pydb.Pdb.old_precmd = pydb.Pdb.precmd
pydb.Pdb.precmd = myprecmd
pydb.debugger(dbg_cmds=['s'] * 30)
# ....
####################
I believe the same is applicable to pdb, although I haven't
investigated.
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