Issue 9840:  Add reprlib.recursive_repr(), a decorator for handling recursive calls to __repr__ methods.

meet the API of the collections.Sequence ABC.

if the format string is not empty. Manually merge r79596 and r84772
from 2.x.

Also, apparently test_format() from test_builtin never made it into
3.x. I've added it as well. It tests the basic format()
infrastructure.

(macpath module).

when tracing methods.  Unit tests. Patch by Eli Bendersky.

Make test.regrtest.__file__ absolute, this was not always the case when running profile or trace, for example.  (issue #9323)

re-created on a subsequent call to Py_Initialize().  The problem (a crash)
wouldn't appear in 3.1 or 2.7 where the GIL's structure is more trivial.

Try to fix buildbot error in other way.

The internal unicode database is now always used.

(after 5 years: see
  http://mail.python.org/pipermail/python-dev/2004-December/050193.html
)

  to Doc/license.rst.

with Python2.7.

ZipFile.open()) could return more bytes than requested.

Instead of the locale encoding.