New submission from Marco Rougeth <ma...@rougeth.com>:

If dbm.open is used with the flags 'r' or 'w' (read-only) to open a file that 
doesn't exist, it raises an exception with the message "need 'c' or 'n' flag to 
open new db". It'd be better to have a more explicit error message like "db 
file doesn't exist, use 'c' or 'n' flag to open new db".

----------
messages: 337462
nosy: rougeth
priority: normal
pull_requests: 12220
severity: normal
status: open
title: Improve error message on dbm.open

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue36232>
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