Issue24898 - Improve str.find documentation.

Simplify str.find explaination as per Georg Brandl's suggestion.

attribute of mktime, with valid values and meaning.

Patch contributed by Andrew Scheller.

Reported by Anatoly Techtonik on docs@

subclasses of list or dict and haven't implemented any pickle-related
methods (__reduce__, __reduce_ex__, __getnewargs__, __getnewargs_ex__,
or __getstate__), can no longer be pickled.  Including memoryview.

This patch is manually crafted and contains changes that couldn't be handled
automatically.

The patch is automatically generated, it replaces the code that uses Py_CLEAR.

macro Py_SETREF.

Added tests for dict views.

This allows sys.getsize() to work correctly with their subclasses with
__slots__ defined.

and some tests no longer behaves incorrectly in the presence of the
PYTHONHASHSEED environment variable.

in ElementTree.iterparse().

and link with OpenSSL 1.0.2e.