Use gdbm_count if possible

[sam-s]

BPO	32494
Nosy	@pitrou, @corona10, @sam-s, @ZackerySpytz
PRs	bpo-32494: Add gdbm.count() #19569 bpo-32494: Use gdbm_count for dbm_length if possible #19814

^{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 = <Date 2020-05-01.12:15:54.982>
created_at = <Date 2018-01-04.21:41:33.758>
labels = ['type-feature', 'library', '3.9']
title = 'Use gdbm_count if possible'
updated_at = <Date 2020-05-01.12:15:54.982>
user = 'https://github.com/sam-s'

bugs.python.org fields:

activity = <Date 2020-05-01.12:15:54.982>
actor = 'pitrou'
assignee = 'none'
closed = True
closed_date = <Date 2020-05-01.12:15:54.982>
closer = 'pitrou'
components = ['Library (Lib)']
creation = <Date 2018-01-04.21:41:33.758>
creator = 'sam-s'
dependencies = []
files = []
hgrepos = []
issue_num = 32494
keywords = ['patch']
message_count = 2.0
messages = ['309483', '367837']
nosy_count = 4.0
nosy_names = ['pitrou', 'corona10', 'sam-s', 'ZackerySpytz']
pr_nums = ['19569', '19814']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue32494'
versions = ['Python 3.9']

[sam-s]

gdbm offers a function to quickly find number of records: gdbm_count()
http://www.gnu.org/software/gdbm/manual/html_node/Count.html
It would be nice to be able to call it.

[pitrou]

New changeset 8727664 by Dong-hee Na in branch 'master':
bpo-32494: Use gdbm_count for dbm_length if possible (GH-19814)
8727664