Serhiy Storchaka <storchaka+cpyt...@gmail.com> added the comment:

Agree with Batuhan. There are three dbm implementations in the stdlib: dumb, 
ndbm and gnu. It may be possible to implement the "x" flag in the former two, 
but gdbm_open() does not support it.

Since by default the implementation is chosen automatically in dbm.open(), I do 
not think it is practically to implement a flag which do not work with all 
implementations.

----------
nosy: +serhiy.storchaka
resolution:  -> rejected
stage: needs patch -> resolved
status: open -> closed

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue22964>
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