String annotations [PEP 563] (#4390)

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* Document `from __future__ import annotations`
* Provide plumbing and tests for `from __future__ import annotations`
* Implement unparsing the AST back to string form

This is required for PEP 563 and as such only implements a part of the
unparsing process that covers expressions.

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Guido van Rossum 2018-01-26 08:20:18 -08:00 • committed by Łukasz Langa

parent d7773d92bd

commit 95e4d58913

16 changed files with 1476 additions and 29 deletions

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