Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.lang.python > #74368

Re: Save/restore breakpoints between pdb runs

Show key headers only | View raw

Ed Blackman <ed@edgewood.to> writes:
> I've recently started using Python for my job (as opposed to writing
> smallish scripts for personal use), and so have needed to debug quite
> a bit more.
>
> I've been using pdb mainly via 'python -m pdb script args'.  Perhaps
> it's my Java background, but even when I have permissions to change
> the source, I find editing source to insert 'import pdb;
> pdb.set_trace()' unnatural.  The consequence is that I have to
> recreate my breakpoints when I have to exit pdb.
>
> I've written the following code, which I load from .pdbrc with
> 'execfile(os.path.expanduser('~/.pydb.py'))'

This approach does not seem very robust to me:

  "pdb" resolves all breakpoints to lines (in source files) - and
  any modification to the source may change the lines.
  As a consequence, your breakpoints may no longer be at the
  places where you expect them.


A long time ago, I have developped "dm.pdb" - a slight
extension/improvement over "pdb". One of the extensions
has been to make it possible to set breakpoints from outside
the debugger -- without too many surprises. It looks somehow like that:

  from dm.pdb import Pdb; D = Pdb()
  ...
  from ... import f
  from ... import g
  from ... import C
  ...
  D.do_break("f") # set breakpoint on "f"
  D.do_break("g") # set breakpoint on "g"
  D.do_breack("C.m") # set breakpoint on method "m" of class "C"
  ...
  D.run("...")

It is more robust than breakpoints on line numbers - but, of course,
it cannot be automated but must be targeted to individual programs.
In addition, the robustness is limited to breakpoints on
executable objects; setting breakpoints on line numbers is possible, too --
but has the same problem with moving lines.


In the meantime, "pdb" itself may support this form of external
control (maybe even better then "dm.pdb").

Back to comp.lang.python | Previous | Next — Previous in thread | Find similar | Unroll thread

Thread

Save/restore breakpoints between pdb runs Ed Blackman <ed@edgewood.to> - 2014-07-11 15:16 -0400
  Re: Save/restore breakpoints between pdb runs dieter <dieter@handshake.de> - 2014-07-12 08:05 +0200

csiph-web