plot(sin(x)) does not always work

[videlec]

As reported in https://ask.sagemath.org/question/40131/

sage: plot(sin(x))
/opt/sagemath-8.0/local/lib/python2.7/site-packages/sage/repl/rich_output/display_manager.py:590: RichReprWarning: Exception in _rich_repr_ while displaying object: 'ascii' codec can't decode byte 0xea in position 6: ordinal not in range(128)
  RichReprWarning,  Graphics object consisting of 1 graphics primitive

[embray]

I suspect this is not actually a Windows-specific issue.

[slel]

Likely fixed by [Sage Trac ticket 25702: Upgrade to matplotlib 2.2.2]
thanks to [matplotlib ticket 10017: unicode_literals considered harmful]
fixed by [matplotlib PR 10044: Remove some uses of unicode_literals].

[embray]

Thanks; I agree it is likely fixed, though I admit I haven't tested. Feel free to reopen if the issue still occurs.