Issue #20411: Use readline.get_current_history_length to check for the presence of a history, rather than get_history_item, which assumes a history is present.

Issue #19375: The site module adding a "site-python" directory to sys.path, if it exists, is now deprecated.

I forgot to hit save.

to speed up interpreter start.

Issue #9548: Add a minimal "_bootlocale" module that is imported by the _io module instead of the full locale module.

Issue #5845: In site.py, only load readline history from ~/.python_history if no history has been read already.  This avoids double writes to the history file at shutdown.

Fixes issue #18206 Patch contributed by  Berker Peksag and py.user

Patch by Berker Peksag.

Issue #18621: Prevent the site module's patched builtins from keeping too many references alive for too long.

It creates a refleak in subinterpreters, as atexit callbacks aren't triggered at their end.

Issue #18214: Improve finalization of Python modules to avoid setting their globals to None, in most cases.

ModuleNotFoundError.

Issue #5845: Enable tab-completion in the interactive interpreter by default, thanks to a new sys.__interactivehook__.

(original patch by Éric Araujo)

This commit fixes a bug in the 'site' module that was causing an exception
to incorrectly be thrown when running 'python -S -m site'.  The problem was
that 'USER_BASE' and 'USER_SITE' were being accessed before they were properly
initialized.  The code has been changed to use 'getuserbase' and
'getusersitepackages' instead so that the initialization always happens.

none are explicitly passed in.

importlib._bootstrap is now frozen into Python/importlib.h and stored
as _frozen_importlib in sys.modules. Py_Initialize() loads the frozen
code along with sys and imp and then uses _frozen_importlib._install()
to set builtins.__import__() w/ _frozen_importlib.__import__().

The U flag is no more used (but still accepted for backward compatibility).

Original patch by Carl Meyer, review by Brett Cannon, small doc editions by
yours truly.  Fixes #11591.

svn+ssh://pythondev@svn.python.org/python/branches/py3k

........
  r87497 | r.david.murray | 2010-12-26 14:54:29 -0500 (Sun, 26 Dec 2010) | 7 lines

  #5258/#10642: print fn, line, traceback and continue when .pth file is broken

  If a .pth file contained an error, it could cause a traceback in site.py,
  terminating its processing.  In 2.7 and 3.2, the interpreter will then not
  start.  Previously, a message would print saying to use -v to get the
  traceback.  In either case, the traceback generated for a failed .pth file did
  not include the .pth filename, making it difficult to debug the problem.  Now
  site.py reports not only the .pth filename but also the line number causing the
  error, and just skips the remainder of the file.
........

svn+ssh://pythondev@svn.python.org/python/branches/py3k

........
  r87497 | r.david.murray | 2010-12-26 14:54:29 -0500 (Sun, 26 Dec 2010) | 7 lines

  #5258/#10642: print fn, line, traceback and continue when .pth file is broken

  If a .pth file contained an error, it could cause a traceback in site.py,
  terminating its processing.  In 2.7 and 3.2, the interpreter will then not
  start.  Previously, a message would print saying to use -v to get the
  traceback.  In either case, the traceback generated for a failed .pth file did
  not include the .pth filename, making it difficult to debug the problem.  Now
  site.py reports not only the .pth filename but also the line number causing the
  error, and just skips the remainder of the file.
........

If a .pth file contained an error, it could cause a traceback in site.py,
terminating its processing.  In 2.7 and 3.2, the interpreter will then not
start.  Previously, a message would print saying to use -v to get the
traceback.  In either case, the traceback generated for a failed .pth file did
not include the .pth filename, making it difficult to debug the problem.  Now
site.py reports not only the .pth filename but also the line number causing the
error, and just skips the remainder of the file.

svn+ssh://pythondev@svn.python.org/python/branches/py3k

........
  r85386 | victor.stinner | 2010-10-13 00:23:23 +0200 (mer., 13 oct. 2010) | 3 lines

  Issue #6612: Fix site and sysconfig to catch os.getcwd() error, eg. if the
  current directory was deleted.
........
  r85387 | victor.stinner | 2010-10-13 00:26:08 +0200 (mer., 13 oct. 2010) | 2 lines

  #6612: add the author of the patch (W. Trevor King)
........
  r85389 | victor.stinner | 2010-10-13 00:42:37 +0200 (mer., 13 oct. 2010) | 2 lines

  NEWS: Move #6612 to Library section
........

svn+ssh://pythondev@svn.python.org/python/branches/py3k

........
  r85386 | victor.stinner | 2010-10-13 00:23:23 +0200 (mer., 13 oct. 2010) | 3 lines

  Issue #6612: Fix site and sysconfig to catch os.getcwd() error, eg. if the
  current directory was deleted.
........
  r85387 | victor.stinner | 2010-10-13 00:26:08 +0200 (mer., 13 oct. 2010) | 2 lines

  #6612: add the author of the patch (W. Trevor King)
........
  r85389 | victor.stinner | 2010-10-13 00:42:37 +0200 (mer., 13 oct. 2010) | 2 lines

  NEWS: Move #6612 to Library section
........