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Initial patch by Vajrasky Kok.
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Nick Coghlan said on bpo-28814:
> inspect.getargvalues() and inspect.formatargvalues() were deprecated
> in Python 3.5 as part of implementing bpo-20438
> This is incorrect, as these are *frame* introspection related functions,
> not callable introspection ones. The documentation and implementation
> layout is confusing though, as they're interleaved with the callable
> introspection operation
This commit undeprecates these functions and adds a note to ignore
previous deprecation notices.
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Patch by Eric Appelt.
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This is still useful for single source Python 2/3 code
migrating away from inspect.getargspec(), but that wasn't
clear with the documented deprecation in place.
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Reformat header above separator line (added if missing) to a common format.
Patch by Yoni Lavi.
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inspect.signature now reports the implicit ``.0`` parameters generated by
the compiler for comprehension and generator expression scopes as if they
were positional-only parameters called ``implicit0``.
Patch by Jelle Zijlstra.
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synopsis line and other lines.
Patch contributed by Nathan Harold.
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other lines.
Patch contributed by Nathan Harold.
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Original patch by James Edwards.
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Original patch by James Edwards.
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The decision is that we shouldn't remove popular APIs (however long they
are depreacted) from Python 3, while 2.7 is still around and supported.
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Noticed by Yaroslav Halchenko.
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Patch by Martin Panter.
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Patch by Martin Panter.
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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.
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Patch by Benno Leslie and Yury Selivanov.
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Suggested by Martin Panter.
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isawaitable() was added before collections.abc.Awaitable; now,
with Awaitable, it is no longer needed (we don't have ishashable()
or isiterable() methods in the inspect module either).
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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")
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Also, deprecate formatargspec, formatargvalues, and getargvalues
functions. Since we are deprecating 'getfullargspec' function in
3.5 (documentation only, no DeprecationWarning), it makes sense
to also deprecate functions designed to be directly used with it.
In 3.6 we will remove 'getargsspec' function (was deprecated since
Python 3.0), and start raising DeprecationWarnings in other
'getarg*' family of functions. We can remove them in 3.7 or later.
Also, it is worth noting, that Signature API does not provide 100%
of functionality that deprecated APIs have. It is important to do
a soft deprecation of outdated APIs in 3.5 to gather users feedback,
and improve Signature object.
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