Bugs item #1687163, was opened at 2007-03-23 17:51
Message generated for change (Comment added) made by collinwinter
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Category: Python Interpreter Core
Group: Python 3000
>Status: Closed
>Resolution: Fixed
Priority: 5
Private: No
Submitted By: Raymond Hettinger (rhettinger)
Assigned to: Collin Winter (collinwinter)
Summary: Inconsistent Exceptions for Readonly Attributes
Initial Comment:
Attempting assignment to a readonly attribute raises an Attribute error for
pure Python attributes but raises a TypeError for C readonly attributes. I
think the AttributeError is the correct exception.
>>> class A(object):
... _x = []
...
... @property
... def x(self):
... return self._x
...
>>> a = A()
>>> a.x = None
Traceback (most recent call last):
a.x = None
AttributeError: can't set attribute
>>> def f():
... yield None
>>> g = f()
>>> g.gi_frame = None
Traceback (most recent call last):
g.gi_frame = None
TypeError: readonly attribute
----------------------------------------------------------------------
>Comment By: Collin Winter (collinwinter)
Date: 2007-03-28 17:45
Message:
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Fixed in r54602.
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Comment By: Raymond Hettinger (rhettinger)
Date: 2007-03-26 16:18
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Collin, would you please apply this to the Py3K code.
----------------------------------------------------------------------
Comment By: Raymond Hettinger (rhettinger)
Date: 2007-03-23 19:52
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Here's the one line change:
Index: Python/structmember.c
===================================================================
--- Python/structmember.c (revision 54557)
+++ Python/structmember.c (working copy)
@@ -160,7 +160,7 @@
if ((l->flags & READONLY) || l->type == T_STRING)
{
- PyErr_SetString(PyExc_TypeError, "readonly attribute");
+ PyErr_SetString(PyExc_AttributeError, "readonly
attribute");
Four of the tests will need to be updated:
test_csv test_descr test_generators test_os
----------------------------------------------------------------------
Comment By: Raymond Hettinger (rhettinger)
Date: 2007-03-23 18:16
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Readonly methods throw an AttributeError, but readonly members (anything
defined in PyMemberDef with an RO or READONLY flag) raise a TypeError.
----------------------------------------------------------------------
Comment By: Jack Diederich (jackdied)
Date: 2007-03-23 18:12
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I think this has something peculiar to frames, for instance:
Python 2.5 (r25:51908, Sep 25 2006, 17:50:07)
[GCC 4.0.3 (Ubuntu 4.0.3-1ubuntu5)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> f = 'asdf'
>>> f.strip = 42
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
AttributeError: 'str' object attribute 'strip' is read-only
>>>
----------------------------------------------------------------------
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