Algorithm and initial patch by Michael Henry.

Move __name__ back out of the template; the responsibility
for setting __name__ lies with the caller (which knows
something about the new namespace), not with the class
definition (which doesn't know about the namespace it is
being built in).

paths.

__import__ does a little trick when importing from bytecode by
back-patching the co_filename paths to point to the file location
where the code object was loaded from, *not* where the code object was
originally created. This allows co_filename to point to a valid path.
Problem is that co_filename is immutable from Python, so a private
function -- imp._fix_co_filename() -- had to be introduced in order to
get things working properly. Originally the plan was to add a file
argument to marshal.loads(), but that failed as the algorithm used by
__import__ is not fully recursive as one might expect, so to be fully
backwards-compatible the code used by __import__ needed to be exposed.

This closes issue #6811 by taking a different approach than outlined
in the issue.

This makes it obvious that an import failed because of some extraneous
whitespace (e.g., a newline).

This is a partial fix for issue #8754.

appropriate number of parallel workers.

parallel (thanks Michael for pointing this).

Patch by Michael Henry.

Issue #11244: Remove outdated peepholer check that was preventing the peepholer from folding -0 and -0.0.  Thanks Eugene Toder for the patch.