(a) "except E, V" -> "except E as V"
(b) V is now limited to a simple name (local variable)
(c) V is now deleted at the end of the except block

(From SF patch #810751)

    (I've tested the fixes, but please proofread anyway.)

  operators per line or statement are now on by default, and -m turns
  these warnings off.

- Change the way multiple / operators are reported; a regular
  recommendation is always emitted after the warning.

- Report ambiguous warnings (both int|long and float|complex used for
  the same operator).

- Update the doc string again to clarify all this and describe the
  possible messages more precisely.

division, and this makes sense.  Add -Qwarnall to warn for all
classic divisions, as required by the fixdiv.py tool.

treated the same as single ones by default.  Added -m option to issue
a warning for this case instead.

percolated out, and some general cleanup.  The output is still the
same, except it now prints "Index: <file>" instead of "Processing:
<file>", so that the output can be used as input for patch (but only
the diff-style parts of it).

to be change to //.  The code is pretty gross so far, and I promise
I'll work on this more, but I have to go eat now! :-)