catch_warnings(), and clean up the API.

While expanding the test suite, a bug was found where a warning about the
'line' argument to showwarning() was not letting functions with '*args' go
without a warning.

Closes issue 3602.
Code review by Benjamin Peterson.

Reviewer: Benjamin Peterson

a unicode argument.

will backport.

svn+ssh://pythondev@svn.python.org/sandbox/trunk/2to3/lib2to3

........
  r65887 | benjamin.peterson | 2008-08-19 17:45:04 -0500 (Tue, 19 Aug 2008) | 1 line

  allow the raw_input fixer to handle calls after the raw_input (ie. raw_input().split())
........
  r65889 | benjamin.peterson | 2008-08-19 18:11:03 -0500 (Tue, 19 Aug 2008) | 1 line

  no need for 2.4 compatibility now
........
  r65967 | benjamin.peterson | 2008-08-21 18:43:37 -0500 (Thu, 21 Aug 2008) | 1 line

  allow a Call to have no arguments
........
  r65968 | benjamin.peterson | 2008-08-21 18:45:13 -0500 (Thu, 21 Aug 2008) | 1 line

  add a fixer for sys.exc_info etc by Jeff Balogh #2357
........
  r65981 | benjamin.peterson | 2008-08-22 15:41:30 -0500 (Fri, 22 Aug 2008) | 1 line

  add a fixer to add parenthese for list and gen comps #2367
........

Reviewed by Marc-Andre Lemburg.

Reviewed by Benjamin Peterson.

Reviewer: Georg Brandl, Benjamin Peterson

Reviewer: Gregory P. Smith

escaped.

be compatible with Python 3.0, also.

  http://www.jcea.es/programacion/pybsddb.htm#bsddb3-4.7.3

of issue #3720.

exception afterwards (for a subsequent parameter), the user code will
not call PyBuffer_Release() and memory will leak.

Reviewed by Amaury Forgeot d'Arc.