python / cpython

Fix the compiler warning:

format specifies type `wint_t` (aka `int`) but the argument has type `unsigned int`

Co-authored-by: Itay Elbirt <anotahacou@gmail.com>

…2322)

# [bpo-41815](): SQLite: fix segfault if backup called on closed database

Attempting to backup a closed database will trigger segfault:

```python
import sqlite3
target = sqlite3.connect(':memory:')
source = sqlite3.connect(':memory:')
source.close()
source.backup(target)
```

…H-20679)

The new API allows to efficiently send values into native generators
and coroutines avoiding use of StopIteration exceptions to signal 
returns.

ceval loop now uses this method instead of the old "private"
_PyGen_Send C API. This translates to 1.6x increased performance
of 'await' calls in micro-benchmarks.

Aside from CPython core improvements, this new API will also allow 
Cython to generate more efficient code, benefiting high-performance
IO libraries like uvloop.

…loop. (GH-22315)

Doc/requirements.txt becomes the reference for packages and package
versions needed to build the Python documentation.

* Doc/Makefile now uses Doc/requirements.txt
* .travis.yml now uses "make env" of Doc/Makefile

* bpo-35293: Remove RemovedInSphinx40Warning

* Update Misc/NEWS.d/next/Documentation/2020-09-12-17-37-13.bpo-35293._cOwPD.rst

Co-authored-by: Victor Stinner <vstinner@python.org>

* bpo-35293: Apply Victor's review

Co-authored-by: Victor Stinner <vstinner@python.org>

Use an unique identifier for the different grammars documented using
the Sphinx productionlist markup.

productionlist markups of the same grammar, like "expressions" or
"compound statements", use the same identifier "python-grammar".

Entry was added by bpo-40939, #21012 and #21039.

)

* When the parameters argument is a list, correctly handle the case
  of changing it during iteration.
* When the parameters argument is a custom sequence, no longer
  override an exception raised in ``__len__()``.

…22091)

* Add new capability to the PEG parser to type variable assignments. For instance:
```
       | a[asdl_stmt_seq*]=';'.small_stmt+ [';'] NEWLINE { a }
```

* Add new sequence types from the asdl definition (automatically generated)
* Make `asdl_seq` type a generic aliasing pointer type.
* Create a new `asdl_generic_seq` for the generic case using `void*`.
* The old `asdl_seq_GET`/`ast_seq_SET` macros now are typed.
* New `asdl_seq_GET_UNTYPED`/`ast_seq_SET_UNTYPED` macros for dealing with generic sequences.
* Changes all possible `asdl_seq` types to use specific versions everywhere.

fix default `_missing_` to return `None` instead of raising a `ValueError`
Co-authored-by: Andrey Darascheka <andrei.daraschenka@leverx.com>

1. The check is on the type
2. Add link to TypeDict

fix bug that let Enums be extended via multiple inheritance

Closes issue41792.

Also closes python/typing#751.

EnumMeta double-checks that `__repr__`, `__str__`, `__format__`, and `__reduce_ex__` are not the same as `object`'s, and replaces them if they are -- even if that replacement was intentionally done in the Enum being constructed.  This patch fixes that.

Automerge-Triggered-By: @ethanfurman

sigprocmask is in section 2, not 3.

Automerge-Triggered-By: @gvanrossum

Automerge-Triggered-By: @ethanfurman

From "can produce difference information in various formats ..."
to " can produce information about file differences in various formats ..."

Automerge-Triggered-By: @Mariatta