New submission from Taylor Newton:

Hi Python Team,

I recently upgraded Python to version 2.7.8 (from 2.6.6) and IPython to version 
5.3.0.  I noticed that when using the magic command (%run -d) in IPython, 
subsequent runs of a program seem to fail with a "KeyError", apparently due to 
the debugger's failure to clear breakpoints from previous runs of the program.

I attached a sample of output from one such failed run, where a breakpoint that 
had been set at line 56 in a previous call caused the program to crash, though 
in the current call, only one breakpoint at line 70 is requested.  

For the time being, I've downgraded to IPython version 4.2.0, which seems to 
work as expected.

Cheers,
Taylor

----------
files: ipython_error
messages: 293712
nosy: Taylor Newton
priority: normal
severity: normal
status: open
title: IPython 5.3.0 debug mode breakpoint issue
type: crash
versions: Python 2.7
Added file: http://bugs.python.org/file46864/ipython_error

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<http://bugs.python.org/issue30370>
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