#12927: Logging synchronises input and output wrongly.
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Reporter: itaibn | Owner: jason
Type: defect | Status: new
Priority: major | Milestone: sage-5.1
Component: misc | Keywords: log logging
Work issues: | Report Upstream: N/A
Reviewers: | Authors:
Merged in: | Dependencies:
Stopgaps: |
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In `sage/misc/log.py`, the following is in the documentation:
{{{
"""
There is an off-by-one issue with IPython's input and output
history; ``__IPYTHON__.input_hist_raw`` is a *list* containing
the un-preparsed Sage commands. However,
``__IPYTHON__.output_hist`` is a dictionary whose keys are
integers and whose values are outputs. This is good because
not every input has an output.
**BUT**, the output from::
__IPYTHON__.input_hist_raw[n]
is stored in::
__IPYTHON__.output_hist[n+1] !
This is annoying and it may be a bug. Right now the loggers
correct for this, but if modifying or extending this code,
consider yourself warned.
"""
}}}
This is incorrect. In fact, the compensation for this inside the code
makes the input and output out of synchronisation. This can be seen in the
following log:
{{{
Sage Log 2012-05-08-190000
1 sage:
sage.misc.preparser.load(sage.misc.preparser.base64.b64decode("L2hvbWUvaXRhaWJuLy5zYWdlLy9pbml0LnNhZ2U="),globals(),False)
2
2 sage: 1+1
3 sage: log_text()
}}}
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/12927>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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