I just noticed how python pip upgraded from printing numerous process bars 
like this:
■■■                   30% completed
■■■■                 40% completed
■■■■■■            60% completed
■■■■■■■■       80% completed
■■■■■■■■■■  100% completed

to a single line of a growing bar and changing declaration.

It is definitely a functionality that  prompts of both Linux and Windows 
allows -
To change the previous print line.
Is it possible to realize this in golang?

  Zhaoxun

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