Patch from Michael Hundson.
format_exception_only() blew up when trying to report a SyntaxError
from a string input (line is None in this case, but it assumed a string).
Bugfix candidate.

line summary followed by blank line and description.

giving it a slight facelift

When the exception has no message, don't insert a colon after the
exception name.

conversion in an exception, but instead display <unprintable %s
object> where %s is the type name.

comments, docstrings or error messages. I fixed two minor things in
test_winreg.py ("didn't" -> "Didn't" and "Didnt" -> "Didn't").

There is a minor style issue involved: Guido seems to have preferred English
grammar (behaviour, honour) in a couple places. This patch changes that to
American, which is the more prominent style in the source. I prefer English
myself, so if English is preferred, I'd be happy to supply a patch myself ;)

built-in messages.

The attached patches update the standard library so that all modules
have docstrings beginning with one-line summaries.

A new docstring was added to formatter.  The docstring for os.py
was updated to mention nt, os2, ce in addition to posix, dos, mac.

disturbing the current exception, and returning tb.tb_lineno, which is
the line number of thr traceback, rather than the current line number.
By Jim Hugunin.

has no line number table etc.

Apparently the traceback object doesn't contains the right linenumber
when -O is used.  Rather than guessing whether -O is on or off, use
tb_lineno() unconditionally.

Also corrected a typo in format_stack (t should've been f).

Also added print_list() and format_list() which format the output from
an extract_*() routine.

	* Lib/macpath.py: don't return trailing colon for dirname()
	(XXX won't do for volume names -- but otherwise glob(':*:*.py')
	loops forever)
	* Lib/traceback.py: print SyntaxError correctly
	* Lib/stat.py: moved to posixstat.py; added macstat.py which has
	the constants for the Mac; and created new stat.py which includes
	the right one
	* Lib/urllib.py: fix caching bug (by disabling the cache)