email.utils.formataddr does not respect double spaces

[AlecRosenbaum]

BPO	47244
Nosy	@warsaw, @bitdancer, @AlecRosenbaum

^{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 2022-04-06.17:45:12.930>
labels = ['type-bug', '3.8', 'expert-email', '3.10', '3.11', '3.7', '3.9']
title = 'email.utils.formataddr does not respect double spaces'
updated_at = <Date 2022-04-06.17:45:12.930>
user = 'https://github.com/AlecRosenbaum'

bugs.python.org fields:

activity = <Date 2022-04-06.17:45:12.930>
actor = 'AlecRosenbaum'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['email']
creation = <Date 2022-04-06.17:45:12.930>
creator = 'AlecRosenbaum'
dependencies = []
files = []
hgrepos = []
issue_num = 47244
keywords = []
message_count = 1.0
messages = ['416891']
nosy_count = 3.0
nosy_names = ['barry', 'r.david.murray', 'AlecRosenbaum']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue47244'
versions = ['Python 3.7', 'Python 3.8', 'Python 3.9', 'Python 3.10', 'Python 3.11']

Linked PRs

• gh-91400: make sure email parsing dont unquote realnames with spaces #92638

[AlecRosenbaum]

It seems that email.utils.formataddr and email.utils.parseaddr are not directly inverse from each other, because formataddr does not respect double spaces within the "realname" section.

For example:

from email.utils import formataddr, parseaddr

identity = '"foo  bar" <foo@example.com>'

print(formataddr(parseaddr(identity)))
# 'foo  bar <foo@example.com>'

print(formataddr(parseaddr(formataddr(parseaddr(identity)))))
# 'foo bar <foo@example.com>'

The first round trip strips the quotes, and the second round trip strips the double space in the "realname" section.

The utility function only seems to check for special characters, but it should also check for double spaces.