Re: zope.testing.testrunner.debug.post_mortem and try/finally

On Thu, Dec 03, 2009 at 03:51:06PM +0200, Marius Gedminas wrote:
> On Thu, Dec 03, 2009 at 08:55:32AM +0100, Wichert Akkerman wrote:
> > On 2009-12-2 23:06, Marius Gedminas wrote:
> > > On Wed, Dec 02, 2009 at 01:36:37PM -0500, Benji York wrote:
> > >> Here's another idea: a testrunner option that takes a file name and line
> > >> number and inserts a breakpoint at that position.  That way you can get
> > >> the same effect as editing the code without actually having to do so.
> > >
> > > Is that possible?  I once spent hours studying pdb docs and found no way
> > > to set a breakpoint in advance, without modifying the source file in
> > > question, and without having the user to do manual interaction at the
> > > beginning.
> > 
> > I think mr.freeze (see http://pypi.python.org/pypi/mr.freeze ) can do 
> > this.
> 
> Thank you for the link, this looks very interesting.
> 
> > Perhaps there is some code there you could borrow.
> 
> Or just depend and invoke it.

Better not, it pulls in too much stuff (WSGI and Zope 2 bits).

> AFAICS mr.freeze subclasses Pdb and
> rewires some of its internals in a nontrivial fashion to be able to do that:
> http://dev.plone.org/collective/browser/mr.freeze/trunk/mr/freeze/freeze.py

I've had some success with this:

import pdb

class SlightlyLessInsanePdb(pdb.Pdb):
    first_time = True
    def user_line(self, *a, **kw):
        if self.first_time:
            self.set_continue()
            self.first_time = False
        else:
            pdb.Pdb.user_line(self, *a, **kw)

def run_with_breakpoint(filename, lineno, func, *args, **kw):
    dbg = SlightlyLessInsanePdb()
    dbg.set_break(filename, lineno)
    return dbg.runcall(func, *args, **kw)


Marius Gedminas
-- 
http://pov.lt/ -- Zope 3 consulting and development

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