Tal Einat <talei...@gmail.com> added the comment:

I can't say I agree that the performance here is practically insignificant. 
This will affect the startup time of Python process, and adding even 10% to 
that in some cases is significant.

In some of the larger codebases I've worked on, even simple scripts would 
import large portions of the system, and there would be thousands of such 
imports done in the process. There are "basic" utilities in the stdlib which 
are imported very often in different modules, so the performance of the import 
statement is not necessarily insignificant compared to that of actually loading 
the modules.

That being said I'm all for getting this in and implementing an optimization of 
the slower path in time for 3.7.

----------
nosy: +taleinat

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<https://bugs.python.org/issue21720>
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