tests (issue13477).

Original patch by Berker Peksag.

for some builtins.

over all CPython source files.

"format units" as legacy converters, as well as two new features:
"self converters" and the "version" directive.

computes the stack effect of bytecode instructions.

create SSLContext objects in Python's stdlib module. It provides a single
configuration point and makes use of SSLContext.load_default_certs().

which anchor the pattern at both ends of the string to match.

Original patch by Matthew Barnett.

Based on patch by Hugo Lopes Tavares.

samples to little-endian and vice versa.

and warns about potential uninitialized use.
Silence that by initializing it to null.

CID 1131948:  Logically dead code  (DEADCODE)

CID 1131946:  Unchecked return value  (CHECKED_RETURN)

CID 1131949:  Dereference null return value  (NULL_RETURNS)

Most of the work is by Alexandre.