Mark Dickinson.

the return values as well as test them.

Thanks to Nicholas Chammas for the bug report and initial patch.

Thanks to Alejandro Santos for the bug report and Anish Shah for the
patch.

Thanks to Chris Wilcox for the initial patch.

Old code is correct, but with Py_SETREF and Py_CLEAR it can be cleaner.
This patch doesn't fix bugs and hence there is no need to backport it.

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

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.

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

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.

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.

macro Py_SETREF.

macro Py_SETREF.

Patch includes contributions by Isobel Hooper, incorporating suggestions from
Paul Winkler.  Reviewed by Martin Panter.

In addition to accepting the corrections for the RFC compliance wording, I
went through and corrected all the argument and return types, and made the
pattern of how the arguments and return types are documented consistent.
So, this patch also addresses #20782, though I had forgotten about that issue
and its patch.

os.fwalk() parameter names.

os.fwalk() parameter names.

Original patch by Samson Lee.

Original patch by Samson Lee.

Iterating elements Element.iter() is now 40% faster,
iterating text Element.itertext() is now up to 2.5 times faster.