[issue9230] pdb.Pdb.checkline() throws AttributeError if called before starting a debug session
report at bugs.python.org
Mon Jul 12 05:56:30 CEST 2010
New submission from Ivan Pozdeev <ivan_pozdeev at mail.ru>:
pdb.Pdb.checkline() throws AttributeError at pdb.py:470 if invoked before starting a debugging session because self.curframe doesn't exist at that time.
This breaks IPython's %run magic command (v0.10, Magic.py:1663). The command sets a breakpoint before running the script and scans the file before that to make sure the breakpoint is set on an executable line.
This is a reasonable thing to do: setting a breakpoint and making sure it is set correctly shouldn't require a running debug session. So i conclude it is pdb, not IPython, that shall be fixed.
The patch attached gives linecache.getline() None as module_globals if self.curframe doesn't exist.
The rationale is: even if the script does use PEP302 import stuff, we can't know or use that before running it. So it's ok if we stay limited with usual paths.
components: Library (Lib)
title: pdb.Pdb.checkline() throws AttributeError if called before starting a debug session
versions: Python 2.7
Added file: http://bugs.python.org/file17955/pdb_checkline.patch
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