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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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3
Include/compile.h
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@ -16,7 +16,7 @@ PyAPI_FUNC(PyCodeObject *) PyNode_Compile(struct _node *, const char *);
#define PyCF_MASK (CO_FUTURE_DIVISION | CO_FUTURE_ABSOLUTE_IMPORT | \
CO_FUTURE_WITH_STATEMENT | CO_FUTURE_PRINT_FUNCTION | \
CO_FUTURE_UNICODE_LITERALS | CO_FUTURE_BARRY_AS_BDFL | \
CO_FUTURE_GENERATOR_STOP)
CO_FUTURE_GENERATOR_STOP | CO_FUTURE_ANNOTATIONS)
#define PyCF_MASK_OBSOLETE (CO_NESTED)
#define PyCF_SOURCE_IS_UTF8 0x0100
#define PyCF_DONT_IMPLY_DEDENT 0x0200
@ -45,6 +45,7 @@ typedef struct {
#define FUTURE_UNICODE_LITERALS "unicode_literals"
#define FUTURE_BARRY_AS_BDFL "barry_as_FLUFL"
#define FUTURE_GENERATOR_STOP "generator_stop"
#define FUTURE_ANNOTATIONS "annotations"
struct _mod; /* Declare the existence of this type */
#define PyAST_Compile(mod, s, f, ar) PyAST_CompileEx(mod, s, f, -1, ar)