Smart help again

[wittempj@hotmail.com]

You can create your own Exception class, based on thisrecipe:
http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/52215, it will
look like

-import sys, traceback
-
-class Error:
-    def __init__(self, arg):
-        self._arg = arg
-        tb = sys.exc_info()[2]
-        while 1:
-            if not tb.tb_next:
-                break
-            tb = tb.tb_next
-        stack = []
-        f = tb.tb_frame
-        while f:
-            stack.append(f)
-            f = f.f_back
-        stack.reverse()
-        #traceback.print_exc()
-        print "Locals by frame, innermost last"
-        for frame in stack:
-            print
-            print "Frame %s in %s at line %s" % \
-                (frame.f_code.co_name, frame.f_code.co_filename,
-frame.f_lineno)
-            for key, value in frame.f_locals.items():
-                print "\t%20s = " % key,
-                #We have to be careful not to cause a new error in our
-error
-                #printer! Calling str() on an unknown object could
cause -an
-                #error we don't want.
-                try:
-                    print value
-                except:
-                    print "<ERROR WHILE PRINTING VALUE>"-
-
-    def __repr__(self):
-        return repr(self._arg)
-

suppose this class is in a module named test.py, then your code can be
like:

-#!/usr/bin/env python
-import test, sys

-try:
-    try:
-        class Spam:
-            def eggs(self):
-                return 1/0
-        foo = Spam()
-        foo.eggs()
-    except:
-        raise test.Error('xxx')
-except test.Error, e:
-    print >> sys.stderr, e.__class__.__name__, e


The output will be:
-Locals by frame, innermost last
-
-Frame ? in ./test2.py at line 12
-                        Spam =  __main__.Spam
-                __builtins__ =  <module '__builtin__' (built-in)>
-                    __file__ =  ./test2.py
-                         sys =  <module 'sys' (built-in)>
-                        test =  <module 'test' from
'/home/martin/test.pyc'>
-                    __name__ =  __main__
-                         foo =  <__main__.Spam instance at 0xb7e0720c>
-                     __doc__ =  None

-Frame eggs in ./test2.py at line 8
-                        self =  <__main__.Spam instance at 0xb7e0720c>
-Error 'xxx'