[issue18039] dbm.open(..., flag="n") does not work and does not give a warning

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

With this patch 2 of 4 modes ('c' and 'n') work as for other dbm modules. So it would be better to document that 'r' and 'w' work nonstandard, than document that 'n' is not ignored.

And while you are here, may be add a warning in 'r' and 'w' mode when the file does not exist?

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assignee:  -> serhiy.storchaka

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<http://bugs.python.org/issue18039>
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