Feature Requests item #1182143, was opened at 2005-04-13 06:02
Message generated for change (Comment added) made by rhettinger
You can respond by visiting:
https://sourceforge.net/tracker/?func=detail&atid=355470&aid=1182143&group_id=5470
Please note that this message will contain a full copy of the comment thread,
including the initial issue submission, for this request,
not just the latest update.
Category: Python Library
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: Sebastien de Menten (sdementen)
Assigned to: Nobody/Anonymous (nobody)
Summary: making builtin exceptions more informative
Initial Comment:
Using builtin exception information is tricky as it
consists of:
a) the type of exception (easily accessible)
b) the args attribute = a 1 element tuple with a string
1st example:
try:
print foo
except NameError, e:
print e.args
symbol = e.args[0][17:-16]
print symbols
==>
("NameError: name 'foo' is not defined", )
foo
It would be nicer to have:
e.args = ("NameError: name 'foo' is not defined", "foo")
The first element being the current string for backward
compatibilty.
=============================
2nd example:
try:
(4).foo
except NameError, e:
print e.args
==> ("'int' object has no attribute 'foo'",)
It would be nicer to have:
e.args = ("'int' object has no attribute 'foo'", 4, "foo")
Again, the first element being the current string for
backward compatibilty.
=============================
Moreover, in the documentation about Exception, I read
"""Warning: Messages to exceptions are not part of the
Python API. Their
contents may change from one version of Python to the
next without warning
and should not be relied on by code which will run under
multiple versions
of the interpreter. """
So even args could not be relied upon !
But it also means that there is no need to be backward
compatible (I am playing devil's advocate, backward
compatibility is important !)
Seb
ps: There may be problems (that I am not aware) with
a) an exception keeping references to other objects
b) C API that can throw only exceptions with strings
c) a specific advantage of having strings only in builtin
exceptions
----------------------------------------------------------------------
>Comment By: Raymond Hettinger (rhettinger)
Date: 2005-06-02 20:33
Message:
Logged In: YES
user_id=80475
This looks like a good idea to me.
----------------------------------------------------------------------
You can respond by visiting:
https://sourceforge.net/tracker/?func=detail&atid=355470&aid=1182143&group_id=5470
_______________________________________________
Python-bugs-list mailing list
Unsubscribe:
http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
