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This would be extra nice because I would not have to fill in the entire path manually when I'm setting a b(reak).

I agree. It should not be too hard to add complete_break() and other similar methods that do this to Pdb.

Here's a patch for 3.3, adding completion to most commands (either completes locations, breakpoint numbers or expressions). Please test!

Thanks for the work.
I see that completion now works for user-defined variables, but:
* completing with 'b' doesn't work at all
* completing with 'break' only completes the first directory that gets the TAB key
* also, 'break' doesn't complete when I do another try to do auto-completion (works only on first try)

> I see that completion now works for user-defined variables, but:
> * completing with 'b' doesn't work at all
Right, that needs to be added for every shortcut.
> * completing with 'break' only completes the first directory that gets the TAB key
> * also, 'break' doesn't complete when I do another try to do auto-completion (works only on first try)
Indeed. That should be fixed with this new version of the patch.

Works much better, but there are still some issues:
* using relative path completes, but I get something like "'../prog.py' not found from sys.path"
* using "~/" to try to complete the HOME directory doesn't work... it completes the root directory

> * using relative path completes, but I get something like "'../prog.py' not found from sys.path"
That has nothing to do with the completion.
> * using "~/" to try to complete the HOME directory doesn't work... it completes the root directory
Since break doesn't accept "~", I don't see why it should complete it. Keep in mind it's not a shell :)

> Georg Brandl <georg@python.org> added the comment:
>> * using relative path completes, but I get something like "'../prog.py' not found from sys.path"
> That has nothing to do with the completion.
If I give it an absolute path it works, hence the complaint.
>> * using "~/" to try to complete the HOME directory doesn't work... it completes the root directory
> Since break doesn't accept "~", I don't see why it should complete it. Keep in mind it's not a shell :)
Fair enough. Perhaps the completion should not be when encountering
that character?

>>> * using relative path completes, but I get something like "'../prog.py' not found from sys.path"
>> That has nothing to do with the completion.
> If I give it an absolute path it works, hence the complaint.
But that has to do with how relative paths are handled, not with how they are entered: they are taken relative to sys.path[0]. I don't know why, and if that is the useful thing to do, but it's for another issue.
>>> * using "~/" to try to complete the HOME directory doesn't work... it completes the root directory
>> Since break doesn't accept "~", I don't see why it should complete it. Keep in mind it's not a shell :)
> Fair enough. Perhaps the completion should not be when encountering
that character?
That should be easy to do, yes.

> But that has to do with how relative paths are handled, not with how they are entered: they are taken relative to sys.path[0]. I don't know why, and if that is the useful thing to do, but it's for another issue.
Perhaps refuse to complete all relative paths as well?

Nope, don't think so. They are accepted and handled (albeit strangely) after all.

New changeset 01a25f638c83 by Georg Brandl in branch 'default':
Close #14210: add command argument completion to pdb: complete file names, global/local variables, aliases
http://hg.python.org/cpython/rev/01a25f638c83