David Edelsohn <dje....@gmail.com> added the comment:

I am not aware of significant use of 31 bit mode.

But I don't see the benefit of annoying and discouraging users who want to 
experiment with Python and with Linux on Z in 31 bit mode.  Yes, maintenance 
theoretically is a burden, but there have been no recent issues that were 
specific to Linux on Z in 31 bit mode.  In fact, most of the original Linux on 
Z support issues that I opened were endianness issues, which aren't ameliorated 
by removing 31 bit support.  As others have expressed, deprecating 31 bit mode 
only removes the configuration option with no other code simplification.

It seems that it would be better to leave the configuration alone until there 
actually was an unresolved issue that motivated removal.  But I am not aware of 
any client requirement to continue the support.  Leaving the 31 bit 
configuration unchanged is more about maintaining good will among the 
volunteers who are interested in the platform.

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<https://bugs.python.org/issue43179>
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