Addition of mypy cache to gitignore

[onlined]

BPO	33370
Nosy	@brettcannon, @matrixise, @onlined
PRs	bpo-33370: Add mypy cache to gitignore #6614 bpo-33370: Add .mypy_cache to .gitignore #6623

^{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 2018-04-30.19:11:14.997>
created_at = <Date 2018-04-26.23:27:40.859>
labels = ['type-feature', '3.8']
title = 'Addition of mypy cache to gitignore'
updated_at = <Date 2018-04-30.19:11:14.996>
user = 'https://github.com/onlined'

bugs.python.org fields:

activity = <Date 2018-04-30.19:11:14.996>
actor = 'brett.cannon'
assignee = 'none'
closed = True
closed_date = <Date 2018-04-30.19:11:14.997>
closer = 'brett.cannon'
components = []
creation = <Date 2018-04-26.23:27:40.859>
creator = 'onlined'
dependencies = []
files = []
hgrepos = []
issue_num = 33370
keywords = ['patch']
message_count = 3.0
messages = ['315823', '315852', '315882']
nosy_count = 3.0
nosy_names = ['brett.cannon', 'matrixise', 'onlined']
pr_nums = ['6614', '6623']
priority = 'low'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue33370'
versions = ['Python 3.8']

[onlined]

Since Python developers started to use mypy, I need we should add .mypy_cache directories to .gitignore.

[brettcannon]

Python's standard library isn't typed so running mypy on it isn't really beneficial at the moment. Plus you can add .mypy_cache to your global .gitignore file.

I'm not saying we can't add it, I'm just saying it isn't a priority.

[matrixise]

you could use a feature of git for the global .gitignore file

git config --global core.excludesfile ~/.gitignore

source: https://git-scm.com/docs/gitignore/2.17.0