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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.
This commit is contained in:
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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9
Include/ast.h
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@ -16,6 +16,15 @@ PyAPI_FUNC(mod_ty) PyAST_FromNodeObject(
PyObject *filename,
PyArena *arena);
#ifndef Py_LIMITED_API
/* _PyAST_ExprAsUnicode is defined in ast_unparse.c */
PyAPI_FUNC(PyObject *) _PyAST_ExprAsUnicode(
expr_ty e,
int omit_parens);
#endif /* !Py_LIMITED_API */
#ifdef __cplusplus
}
#endif