Really strange
Have you tried to run this on Maya script editor?
import sys
sys.stdout.write("test")
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Yeah at first it did nothing.
In 2019 it still does nothing, but I tried again now in 2020 and the first time I got this:
Error: IOError: file line 2: 9
Then I executed again right after and got nothing again. Really weird
Ok so wow. That explains why you both are saying there are no more lines in the script editor. Something seems wrong with the stdout.
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Do you have any other 3rd party plugins or tools installed, like AnimBot?
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Before you try to reinstall Maya, did you try using fresh preferences? (You don’t have to delete your existing prefs. Just rename the directory temporarily and restart Maya.)
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Did you disable your output console window from popping up? This thread claims that if you did, AND there is any sort of error on Maya startup, this error can occur. http://discourse.techart.online/t/maya-python-ioerror-with-output-window-disabled/9212/3
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I agree with @chrislesage this is quite unusual. I will add that make sure you have this settings on your script editor for the supress settings.
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yes! I did do number 3 a while back.
deleted the environment variable. now everything is back to normal.
shifter builds with normal build log output.
thanks for pointing out where I screwed up 
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