Commit Graph

18 Commits

Author SHA1 Message Date
Yury Selivanov fdbeb2b4b6 Issue #24400: Resurrect inspect.isawaitable()
collections.abc.Awaitable and collections.abc.Coroutine no longer
use __instancecheck__ hook to detect generator-based coroutines.

inspect.isawaitable() can be used to detect generator-based coroutines
and to distinguish them from regular generator objects.
2015-07-03 13:11:35 -04:00
Yury Selivanov 5376ba9630 Issue #24400: Introduce a distinct type for 'async def' coroutines.
Summary of changes:

1. Coroutines now have a distinct, separate from generators
   type at the C level: PyGen_Type, and a new typedef PyCoroObject.
   PyCoroObject shares the initial segment of struct layout with
   PyGenObject, making it possible to reuse existing generators
   machinery.  The new type is exposed as 'types.CoroutineType'.

   As a consequence of having a new type, CO_GENERATOR flag is
   no longer applied to coroutines.

2. Having a separate type for coroutines made it possible to add
   an __await__ method to the type.  Although it is not used by the
   interpreter (see details on that below), it makes coroutines
   naturally (without using __instancecheck__) conform to
   collections.abc.Coroutine and collections.abc.Awaitable ABCs.

   [The __instancecheck__ is still used for generator-based
   coroutines, as we don't want to add __await__ for generators.]

3. Add new opcode: GET_YIELD_FROM_ITER.  The opcode is needed to
   allow passing native coroutines to the YIELD_FROM opcode.

   Before this change, 'yield from o' expression was compiled to:

      (o)
      GET_ITER
      LOAD_CONST
      YIELD_FROM

   Now, we use GET_YIELD_FROM_ITER instead of GET_ITER.

   The reason for adding a new opcode is that GET_ITER is used
   in some contexts (such as 'for .. in' loops) where passing
   a coroutine object is invalid.

4. Add two new introspection functions to the inspec module:
   getcoroutinestate(c) and getcoroutinelocals(c).

5. inspect.iscoroutine(o) is updated to test if 'o' is a native
   coroutine object.  Before this commit it used abc.Coroutine,
   and it was requested to update inspect.isgenerator(o) to use
   abc.Generator; it was decided, however, that inspect functions
   should really be tailored for checking for native types.

6. sys.set_coroutine_wrapper(w) API is updated to work with only
   native coroutines.  Since types.coroutine decorator supports
   any type of callables now, it would be confusing that it does
   not work for all types of coroutines.

7. Exceptions logic in generators C implementation was updated
   to raise clearer messages for coroutines:

   Before: TypeError("generator raised StopIteration")
   After: TypeError("coroutine raised StopIteration")
2015-06-22 12:19:30 -04:00
Yury Selivanov 56fc614025 Issue 24315: Make collections.abc.Coroutine derived from Awaitable 2015-05-29 09:01:29 -04:00
Raymond Hettinger ec219ba1c0 Issue #23086: Add start and stop arguments to the Sequence.index() mixin method. 2015-05-22 19:29:22 -07:00
Yury Selivanov e0104ae103 Issue 24184: Add AsyncIterator and AsyncIterable to collections.abc. 2015-05-14 12:19:16 -04:00
Yury Selivanov 7544508f02 PEP 0492 -- Coroutines with async and await syntax. Issue #24017. 2015-05-11 22:57:16 -04:00
Raymond Hettinger bd60e8dece Issue #24018: Add a collections.Generator abstract base class. 2015-05-09 01:07:23 -04:00
Serhiy Storchaka 34af5023fc Issue #21408: The default __ne__() now returns NotImplemented if __eq__()
returned NotImplemented.  Removed incorrect implementations of __ne__().
2015-01-26 10:04:15 +02:00
Serhiy Storchaka f4b7a02e93 Issue #21408: The default __ne__() now returns NotImplemented if __eq__()
returned NotImplemented.  Removed incorrect implementations of __ne__().
2015-01-26 09:57:07 +02:00
Serhiy Storchaka ae5cb214d2 Issue #22609: Constructors and update methods of mapping classes in the
collections module now accept the self keyword argument.
2014-11-27 16:25:51 +02:00
Serhiy Storchaka 8943ecfab2 Issue #22609: Constructors and update methods of mapping classes in the
collections module now accept the self keyword argument.
2014-11-27 16:35:26 +02:00
Raymond Hettinger 748ff8bfd1 merge 2014-07-03 00:31:54 +01:00
Raymond Hettinger 11cda47661 Fix guidance for subclassing collections.Set() 2014-07-03 00:31:30 +01:00
Raymond Hettinger aa92d342f1 merge 2014-05-26 00:14:14 -07:00
Raymond Hettinger dd5e53a086 Issue 8743: Improve interoperability between sets and the collections.Set abstract base class. 2014-05-26 00:09:04 -07:00
Raymond Hettinger 3170d1cccb Issue #21421: Add __slots__ to the MappingViews ABCs. 2014-05-03 19:06:32 -07:00
Christian Heimes bf235bd212 Issue #19218: set __name__ of _collections_abc to collections.abc in order to fix tests and keep beautiful qualified names. 2013-10-13 02:21:33 +02:00
Christian Heimes f1dc3ee16d Issue #19218: Rename collections.abc to _collections_abc in order to speed up interpreter start 2013-10-13 02:04:20 +02:00