setdefault() with a single argument doesn't work for dbm.gnu and dmb.dumb objects

BPO 33385
Nosy @rhettinger, @ned-deily, @serhiy-storchaka

Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.

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GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2018-04-29.14:00:31.917>
labels = ['3.8', 'type-feature', 'library']
title = "setdefault() with a single argument doesn't work for dbm.gnu and dmb.dumb objects"
updated_at = <Date 2018-04-30.09:11:07.896>
user = 'https://github.com/serhiy-storchaka'

bugs.python.org fields:

activity = <Date 2018-04-30.09:11:07.896>
actor = 'serhiy.storchaka'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2018-04-29.14:00:31.917>
creator = 'serhiy.storchaka'
dependencies = []
files = []
hgrepos = []
issue_num = 33385
keywords = []
message_count = 4.0
messages = ['315898', '315925', '315931', '315943']
nosy_count = 3.0
nosy_names = ['rhettinger', 'ned.deily', 'serhiy.storchaka']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue33385'
versions = ['Python 3.8']

Linked PRs