Update typing for Python 3.7 (1)

[cdce8p]

Description

Part 1 of 3 to update the typing in astroid following the bump to Python 3.7.2

Part 1: Replace typing aliases for builtin types
Part 2: Replace typing aliases for collections.abc classes.
Part 3: Update py-version in pylintrc

[coveralls]

Pull Request Test Coverage Report for Build 2316381986

• 420 of 420 (100.0%) changed or added relevant lines in 33 files are covered.
• 51 unchanged lines in 3 files lost coverage.
• Overall coverage increased (+0.02%) to 91.707%

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Files with Coverage Reduction	New Missed Lines	%
astroid/builder.py	8	95.31%
astroid/rebuilder.py	11	96.97%
astroid/brain/brain_gi.py	32	23.02%

Totals
Change from base Build 2315268094:	0.02%
Covered Lines:	9167
Relevant Lines:	9996

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💛 - Coveralls

[DanielNoord]

I added a white line between imports and docstring whenever there originally was one.

Another approach would be to replace all on the __future__ imports with a white lines in front of it. Black should then remove those case where there are more than one line and we would have consitency across all files.

Rest LGTM!

[DanielNoord]

? Shouldn't this be in a different PR/commit?

[cdce8p]

Need this to fix a no-member issue now that the string annotations are replaced with from __future__ import annotations, see pylint-dev/pylint#6594.

[DanielNoord]

Ah! That explains it!

[cdce8p]

I added a white line between imports and docstring whenever there originally was one.

Added empty lines between every docstring and future import (in the changed files). There is an isort setting lines-before-imports. Unfortunately though it doesn't seem to work reliably for our use case. More promising is a black PR to make that the default behavior: psf/black#2996.