ConfigParser.items(section) with allow_no_value returns empty strings

[SeanRobertson]

BPO	37932

^{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 2019-08-23.20:58:17.224>
labels = ['type-bug', 'library']
title = 'ConfigParser.items(section) with allow_no_value returns empty strings'
updated_at = <Date 2019-08-23.20:58:17.224>
user = 'https://bugs.python.org/SeanRobertson'

bugs.python.org fields:

activity = <Date 2019-08-23.20:58:17.224>
actor = 'Sean Robertson'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2019-08-23.20:58:17.224>
creator = 'Sean Robertson'
dependencies = []
files = []
hgrepos = []
issue_num = 37932
keywords = []
message_count = 1.0
messages = ['350331']
nosy_count = 1.0
nosy_names = ['Sean Robertson']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue37932'
versions = ['Python 3.6']

Linked PRs

• gh-82113: Fix ConfigParser.items() returning '' for value-less options #151898

[SeanRobertson]

Hello and thanks for reading.

I've also experienced this in Python 3.7, and I believe it to be around since 3.2.

The allow_no_value option of ConfigParser allows None values when (de)serializing configuration files. Yet calling the "items(section)" method of a ConfigParser returns empty strings for values instead of None. See below for an MRE.

Thanks,
Sean

Python 3.6.8 (default, Jan 14 2019, 11:02:34)
[GCC 8.0.1 20180414 (experimental) [trunk revision 259383]] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> from configparser import ConfigParser
>>> a = ConfigParser(allow_no_value=True)
>>> a.add_section('foo')
>>> a.set('foo', 'bar')
>>> a.items('foo')
[('bar', '')]
>>> a.items('foo', raw=True)
[('bar', None)]
>>> a.get('foo', 'bar')
>>> list(a['foo'].items())
[('bar', None)]