AttributeError on calling sage.misc.log.log_text() in SageMath 8.9

[Max Alekseyev]

Please advise on the following error.

Thanks,

Max

┌────────────────────────────────────────────────────────────────────┐

│ SageMath version 8.9, Release Date: 2019-09-29                     │

│ Using Python 2.7.15. Type "help()" for help.                       │

└────────────────────────────────────────────────────────────────────┘

sage: import sage.misc.log

sage: sage.misc.log.log_text()

---------------------------------------------------------------------------

AttributeError                            Traceback (most recent call last)

<ipython-input-2-ace4f1da0972> in <module>()

----> 1 sage.misc.log.log_text()

/usr/local/SageMath.89/local/lib/python2.7/site-packages/sage/misc/log.pyc in __init__(self, dir, debug, viewer)

     97         self._dir = dir

     98         self._filename = os.path.join(dir, self._filename())

---> 99         self._output = __IPYTHON__.output_hist

    100         self._input  = __IPYTHON__.input_hist_raw

    101         self._text = ''

AttributeError: 'bool' object has no attribute 'output_hist'

[Dima Pasechnik]

This is a bug
See https://trac.sagemath.org/ticket/28677
Thanks for reporting it - it's a good example of code bitrot due to no
tests... :-)

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[Dima Pasechnik]

In fact, sage/misc/log.py uses very old ipython features, which seem
to be long gone.
A modern way to say e.g. the whole command history to /tmp/xxx.log
would be to run

sage: %history -f /tmp/xxx.log
See
https://stackoverflow.com/questions/16858724/how-to-log-ipython-history-to-text-file/39413200
for more details

HTH
Dima