Commit Graph

476 Commits

Author SHA1 Message Date
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
Benjamin Peterson ee85339cc6 in dict displays, evaluate the key before the value (closes #11205)
Patch partially by Steve Dougherty.
2015-05-28 14:30:26 -05:00
Nick Coghlan d5cacbb1d9 PEP 489: Multi-phase extension module initialization
Known limitations of the current implementation:

- documentation changes are incomplete
- there's a reference leak I haven't tracked down yet

The leak is most visible by running:

  ./python -m test -R3:3 test_importlib

However, you can also see it by running:

  ./python -X showrefcount

Importing the array or _testmultiphase modules, and
then deleting them from both sys.modules and the local
namespace shows significant increases in the total
number of active references each cycle. By contrast,
with _testcapi (which continues to use single-phase
initialisation) the global refcounts stabilise after
a couple of cycles.
2015-05-23 22:24:10 +10:00
Eric Snow 183a941bc1 Issue #24192: Fix namespace package imports. 2015-05-15 21:54:59 -06:00
Benjamin Peterson 025e9ebd0a PEP 448: additional unpacking generalizations (closes #2292)
Patch by Neil Girdhar.
2015-05-05 20:16:41 -04:00
Eric Snow 32439d6eb6 Issue #23911: Move path-based bootstrap code to a separate frozen module. 2015-05-02 19:15:18 -06:00
Brett Cannon f299abdafa Issue #23731: Implement PEP 488.
The concept of .pyo files no longer exists. Now .pyc files have an
optional `opt-` tag which specifies if any extra optimizations beyond
the peepholer were applied.
2015-04-13 14:21:02 -04:00
Brett Cannon 02d8454002 Issue #23014: Make importlib.abc.Loader.create_module() required when
importlib.abc.Loader.exec_module() is also defined.

Before this change, create_module() was optional **and** could return
None to trigger default semantics. This change now reduces the
options for choosing default semantics to one and in the most
backporting-friendly way (define create_module() to return None).
2015-01-09 11:39:21 -05:00
Barry Warsaw d32d4ae4ca - Issue #22966: Fix __pycache__ pyc file name clobber when pyc_compile is
asked to compile a source file containing multiple dots in the source file
  name.
2014-12-01 17:52:43 -05:00
Barry Warsaw 2a413853f1 - Issue #22966: Fix __pycache__ pyc file name clobber when pyc_compile is
asked to compile a source file containing multiple dots in the source file
  name.
2014-12-01 17:10:10 -05:00
Serhiy Storchaka c4464052d9 Issue #19720: Suppressed context for some exceptions in importlib. 2014-11-21 20:33:57 +02:00
Brett Cannon b6e2556d8f Issue #22834: Have import suppress FileNotFoundError when the current
working directory no longer exists.

Thanks to Martin Panter for the bug report.
2014-11-21 12:19:28 -05:00
Brett Cannon 5e8b04eefb Issue #21052: Don't raise ImportWarning for sys.meta_path or
sys.path_hooks when set to None during interpreter shutdown.

Thanks to Martin Panter for the initial bug report.
2014-10-10 10:54:28 -04:00
Brett Cannon 42535f0104 Fix a parameter name to make sense again 2014-05-30 16:28:00 -04:00
Brett Cannon 2a17bde930 Issue #20383: Introduce importlib.util.module_from_spec().
Along the way, dismantle importlib._bootstrap._SpecMethods as it was
no longer relevant and constructing the new function required
partially dismantling the class anyway.
2014-05-30 14:55:29 -04:00
Eric Snow b7f1be309e Merge from 3.4 (for #21226). 2014-05-12 18:25:00 -06:00
Eric Snow 08197a4616 Issue #21226: Set all attrs in PyImport_ExecCodeModuleObject. 2014-05-12 17:54:55 -06:00
Brett Cannon 6eaac13c92 Issue #21156: importlib.abc.InspectLoader.source_to_code() is now a
staticmethod.
2014-05-09 12:28:22 -04:00
Benjamin Peterson d51374ed78 PEP 465: a dedicated infix operator for matrix multiplication (closes #21176) 2014-04-09 23:55:56 -04:00
Brett Cannon a04dbe4fe7 Issue #17621: Introduce importlib.util.LazyLoader. 2014-04-04 13:53:38 -04:00
Brett Cannon a00c2407ca Issue #20884: Don't assume in importlib.__init__ that __file__ is
defined.
2014-03-21 10:58:33 -04:00
Brett Cannon 26dd0ff075 Issue #20763: Fix importlib.machinery.PathFinder to support
PathEntryFinder instances which only define find_module().

Reported by Yukihiro Nakadaira.
2014-02-26 18:26:49 -05:00
Benjamin Peterson a50fd87237 update magic number for #20625 2014-02-19 18:05:36 -05:00
Eric Snow 6029e08691 Issue 19944: Fix importlib.find_spec() so it imports parents as needed.
The function is also moved to importlib.util.
2014-01-25 15:32:46 -07:00
Eric Snow e4314e05d5 Issue 19713: Remove PEP 451-related code that should have been factored out.
This code was an artifact of issuing a DeprecationWarning for the lack
of loader.exec_module().  However, we have deferred such warnings to
later Python versions.
2014-01-07 23:29:19 -07:00
Brett Cannon 8d942296bb Issue #19719: Update various finder and loader ABCs such that their
old methods now provide implementations when PEP 451 APIs are present.

This should help with backwards-compatibility with code which has not
been updated to work with PEP 451.
2014-01-07 15:52:42 -05:00
Eric Snow 1500d49c22 Issue 19713: Add PEP 451-related deprecations. 2014-01-06 20:49:04 -07:00
Eric Snow 3192eac6cf Remove dead PEP 451 code. 2014-01-06 20:38:16 -07:00
Eric Snow d749c7ae68 Issue #19927: Add __eq__ to path-based loaders in importlib. 2014-01-04 15:06:49 -07:00
Eric Snow fbc785188d Issue #20097: Fix bad use of "self" in importlib's WindowsRegistryFinder. 2014-01-02 22:25:00 -07:00
Eric Snow 61e851baca Remove some dead code in importlib, introduced with the PEP 451 patch.
Early in the PEP 451 implementation some of the importlib loaders had
their own _get_spec() methods to simplify accommodating them.  However,
later implementations removed the need.  They simply failed to remove
this code at the same time. :)
2013-12-18 23:35:15 -07:00
Eric Snow b282b3d804 Issue #18864: Add a setter for ModuleSpec.has_location. 2013-12-10 22:16:41 -07:00
Eric Snow c1e7c747f9 Issue 19851: Fix a regression in reloading submodules. 2013-12-09 19:59:10 -07:00
Brett Cannon d2476c6e4b Issue #19698: Remove exec_module() from the built-in and extension
module loaders.

Due to the fact that the call signatures for extension modules and
built-in modules does not allow for the specifying of what module to
initialize and that on Windows all extension modules are built-in
modules, work to clean up built-in and extension module initialization
will have to wait until Python 3.5. Because of this the semantics of
exec_module() would be incorrect, so removing the methods for now is
the best option; load_module() is still used as a fallback by
importlib and so this won't affect semantics.
2013-11-29 11:00:11 -05:00
Brett Cannon 224b261258 User the repr for a module name in more places 2013-11-22 14:52:36 -05:00
Brett Cannon 175e7257b1 Remove a commented-out line 2013-11-22 12:07:43 -05:00
Brett Cannon fddc311fe8 Don't assume trying to find a builtin will succeed (e.g. posix isn't on Windows) 2013-11-22 11:58:17 -05:00
Eric Snow b523f8433a Implement PEP 451 (ModuleSpec). 2013-11-22 09:05:39 -07:00
Brett Cannon 2b8fc303ad Abstract out stat calls in importlib for easier experimentation. 2013-11-01 14:04:24 -04:00
Brett Cannon f6901c8baa Issue #19410: Put back in special-casing of '' for
importlib.machinery.FileFinder.

While originally moved to stop special-casing '' as PathFinder farther
up the typical call chain now uses the cwd in the instance of '', it
was deemed an unnecessary risk to breaking subclasses of FileFinder to
take the special-casing out.
2013-11-01 10:37:57 -04:00
Eric Snow cdf601281f Issue #19413: Restore pre-3.3 reload() semantics of re-finding modules. 2013-10-31 22:22:15 -06:00
Benjamin Peterson 6b4f7803f8 cleanup the construction of __qualname__ (closes #19301 again) 2013-10-20 17:50:28 -04:00
Benjamin Peterson 3d9e481ece give explicitly global functions and classes a global __qualname__ (closes #19301) 2013-10-19 16:01:13 -04:00
Brett Cannon 58f5680462 Issue #18810: Be optimistic with stat calls when seeing if a directory
exists when checking for a package.

Before there was an isdir check and then various isfile checks for
possible __init__ files when looking for a package.
This change drops the isdir check by leaning
on the assumption that a directory will not contain something named
after the module being imported which is not a directory. If the module
is a package then it saves a stat call. If there is nothing in the
directory with the potential package name it also saves a stat call.
Only if there is something in the directory named the same thing as
the potential package will the number of stat calls increase
(due to more wasteful __init__ checks).

Semantically there is no change as the isdir check moved
down so that namespace packages continue to have no chance of
accidentally collecting non-existent directories.
2013-10-18 13:24:13 -04:00
Brett Cannon bb9e481efa Issue #18416: Fix various os calls in importlib.machinery.FileFinder
now that self.path is no longer forced to '.'.
2013-10-18 12:01:06 -04:00
Brett Cannon 27e27f7ee1 Issue #18416: Have importlib.machinery.PathFinder treat '' as the cwd
and stop importlib.machinery.FileFinder treating '' as '.'.

Previous PathFinder transformed '' into '.' which led to __file__ for
modules imported from the cwd to always be relative paths. This meant
the values of the attribute were wrong as soon as the cwd changed.
This change now means that as long as the site module is run (which
makes all entries in sys.path absolute) then all values for __file__
will also be absolute unless it's for __main__ when specified by file
path in a relative way (modules imported by runpy will have an
absolute path).

Now that PathFinder is no longer treating '' as '.' it only makes
sense for FileFinder to stop doing so as well. Now no transformation
is performed for the directory given to the __init__ method.

Thanks to Madison May for the initial patch.
2013-10-18 11:39:04 -04:00
Eric Snow 7e70fa5314 [issue 19152] Ensure we have actually registered ExtensionFileLoader as an ExecutionLoader. 2013-10-04 20:28:52 -06:00
Eric Snow 5179445520 [issue19152] Add ExtensionFileLoader.get_filename(). 2013-10-03 12:08:55 -06:00
Eric Snow e8bbfebee0 [issue19951] Fix docstring and use of _get_suppported_file_loaders() to reflect 2-tuples. 2013-10-03 12:08:55 -06:00
Meador Inge 3c56145638 Issue #16826: Revert fix while Windows issues are being worked out. 2013-09-03 19:54:40 -05:00