derived from sr_rs@latin.

Original patch by Georg Brandl.

All Python-specific styling is now in the theme anyway.

We don't want to go into a full explanation of scopes at this point in the
tutorial, so we just mention that the loop creates or overwrites a persistent
variable while the listcomp doesn't.  Not mentioning this would lead someone
to incorrectly assume loops and listcomps were *completely* equivalent, which
would confuse them later.

Original patch by Rose Ames, tweaked to remove the word 'scope'.

Patch by Francis MB.

Move Doc/tools/sphinxext content to Doc/tools, there is no need for the nested subdirectory anymore.

calls that were cancelled.

because _read_null() cannot be used on AIX. On AIX, reading from NULL is
allowed: the first page of memory is a mapped read-only on AIX.

os.posix_fallocate() because their prototypes in system headers are wrong.