Martin Panter added the comment:

What happens instead of aborting the line at step 3? Is Ctrl+C completely 
ignored, as if you didn’t press it?

Perhaps matplotlib is interfering with Python’s SIGINT handler and/or 
PyOS_InputHook().

Can you eliminate ipython from the equation? I.e. does the problem happen with 
the built-in Python interactive interpreter? Or with a simple script like the 
following:

import readline
import matplotlib  # Or whatever is needed to trigger it
while True:
    input("PROMPT ")

----------
nosy: +martin.panter

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue26894>
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