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#16440: fix exception type and clarify example.

This commit is contained in:
Ezio Melotti 2012-11-09 01:03:44 +02:00
parent 3eb0e1da80
commit 090177676a
1 changed files with 15 additions and 8 deletions
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23
Doc/library/stdtypes.rst
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@ -2878,16 +2878,23 @@ that class), otherwise a :exc:`TypeError` is raised.
Like function objects, methods objects support getting arbitrary attributes. Like function objects, methods objects support getting arbitrary attributes.
However, since method attributes are actually stored on the underlying function However, since method attributes are actually stored on the underlying function
object (``meth.im_func``), setting method attributes on either bound or unbound object (``meth.im_func``), setting method attributes on either bound or unbound
methods is disallowed. Attempting to set a method attribute results in a methods is disallowed. Attempting to set an attribute on a method results in
:exc:`TypeError` being raised. In order to set a method attribute, you need to an :exc:`AttributeError` being raised. In order to set a method attribute, you
explicitly set it on the underlying function object:: need to explicitly set it on the underlying function object::
class C: >>> class C:
def method(self): ... def method(self):
pass ... pass
...
>>> c = C()
>>> c.method.whoami = 'my name is method' # can't set on the method
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
AttributeError: 'instancemethod' object has no attribute 'whoami'
>>> c.method.im_func.whoami = 'my name is method'
>>> c.method.whoami
'my name is method'
c = C()
c.method.im_func.whoami = 'my name is c'
See :ref:`types` for more information. See :ref:`types` for more information.