Add SMTPNotSupportedError in the exports of smtplib

[rockwelln]

BPO	38341
Nosy	@warsaw, @bitdancer, @maxking, @rockwelln, @miss-islington
PRs	bpo-38341: Add SMTPNotSupportedError in the exports of smtplib #16525 [3.7] bpo-38341: Add SMTPNotSupportedError in the exports of smtplib (GH-16525) #16590 [3.8] bpo-38341: Add SMTPNotSupportedError in the exports of smtplib (GH-16525) #16721

^{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 2019-10-12.16:29:37.998>
created_at = <Date 2019-10-01.20:50:46.945>
labels = ['type-feature', '3.7', 'expert-email']
title = 'Add SMTPNotSupportedError in the exports of smtplib'
updated_at = <Date 2019-10-12.16:29:37.997>
user = 'https://github.com/rockwelln'

bugs.python.org fields:

activity = <Date 2019-10-12.16:29:37.997>
actor = 'maxking'
assignee = 'none'
closed = True
closed_date = <Date 2019-10-12.16:29:37.998>
closer = 'maxking'
components = ['email']
creation = <Date 2019-10-01.20:50:46.945>
creator = 'Norman.Denayer'
dependencies = []
files = []
hgrepos = []
issue_num = 38341
keywords = ['patch']
message_count = 5.0
messages = ['353712', '353981', '353982', '354533', '354534']
nosy_count = 5.0
nosy_names = ['barry', 'r.david.murray', 'maxking', 'Norman.Denayer', 'miss-islington']
pr_nums = ['16525', '16590', '16721']
priority = 'normal'
resolution = None
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue38341'
versions = ['Python 3.7']

[rockwelln]

Long story short:
smtplib.SMTPNotSupportedError seems the only exception not present in __all__ variable exposed by smtplib.py

Context:
I currently face an issue running mypy on one of my module:
...tools/email.py:46: error: Module has no attribute "SMTPNotSupportedError"
except smtplib.SMTPNotSupportedError:

Digging into the context of this error, I note this exception is not exposed in the list __all__.

Regards,
Norman

[maxking]

It seems that SMTPNotSupportedError is publicly documented, it should be a part of __all__.

[maxking]

New changeset 3faf826 by Abhilash Raj (nde) in branch 'master':
bpo-38341: Add SMTPNotSupportedError in the exports of smtplib (bpo-16525)
3faf826

[miss-islington]

New changeset 1da648a by Miss Islington (bot) in branch '3.8':
bpo-38341: Add SMTPNotSupportedError in the exports of smtplib (GH-16525)
1da648a

[miss-islington]

New changeset cb580d6 by Miss Islington (bot) in branch '3.7':
bpo-38341: Add SMTPNotSupportedError in the exports of smtplib (GH-16525)
cb580d6