Differences between revisions 6 and 8 (spanning 2 versions)

Writing Exception Classes

Exception classes are not special, you just derive them from Exception:

   1 class HostNotFound(Exception):
   2     def __init__( self, host ):
   3         self.host = host
   4         Exception.__init__(self, 'Host Not Found exception: missing %s' % host)

You may later write:

   1 try:
   2     raise HostNotFound( "taoriver.net" )
   3 except HostNotFound, exc:
   4     # Handle exception.
   5     print exc # -> 'Host Not Found exception: missing taoriver.net'
   6     print exc.host # -> 'taoriver.net

Questions

How do you relay the traceback information? Relay the traceback information? Moving it higher up the call-stack? Could you try to explain your question?
- When you're logging exceptions, you want access to the traceback information to. After some research, I believe what you use is extract_tb or extract_stack from the traceback module. -- LionKimbro DateTime(2003-09-07T15:23:43Z)
What better exception-foo is out there?

-  ⇤ ← Revision 6 as of 2003-09-07 15:23:43 → 
  Size: 1125
  Editor: dsl254-010-130
  Comment: __str__ section no longer necessary, answered question, added "See Also".
+   ← Revision 8 as of 2003-09-07 16:24:05 → ⇥
  Size: 1085
  Editor: ip503dabc3
  Comment:
-Deletions are marked like this.
+Additions are marked like this.
 Line 2:
-I (LionKimbro) don't know much about writing exception classes; Here's hoping someone rewrites this better.
-Line 21:
+Line 19:
-except HostNotFound, X:
+except HostNotFound, exc:
-Line 23:
+Line 21:
-    # "X" is the HostNotFound instance.
+    print exc # -> 'Host Not Found exception: missing taoriver.net'
    print exc.host # -> 'taoriver.net
 Line 33:
-     * When you're logging exceptions, you want access to the traceback information to. After some research, I believe what you use is extract_tb or extract_stack from the traceback module. -- 216.254.10.130 [[DateTime(2003-09-07T15:23:43Z)]]
+     * When you're logging exceptions, you want access to the traceback information to. After some research, I believe what you use is extract_tb or extract_stack from the traceback module. -- LionKimbro [[DateTime(2003-09-07T15:23:43Z)]]

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Writing Exception Classes

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