diff options
Diffstat (limited to 'Doc')
| -rw-r--r-- | Doc/lib/libstdtypes.tex | 32 |
1 files changed, 18 insertions, 14 deletions
diff --git a/Doc/lib/libstdtypes.tex b/Doc/lib/libstdtypes.tex index df53ec3..79221b8 100644 --- a/Doc/lib/libstdtypes.tex +++ b/Doc/lib/libstdtypes.tex @@ -982,6 +982,16 @@ attributes. \emph{Note that the current implementation only supports function attributes on functions written in Python. Function attributes on built-ins may be supported in the future.} +Functions have another special attribute \code{\var{f}.__dict__} +(a.k.a. \code{\var{f}.func_dict}) which contains the namespace used to +support function attributes. \code{__dict__} can be accessed +directly, set to a dictionary object, or \code{None}. It can also be +deleted (but the following two lines are equivalent): + +\begin{verbatim} +del func.__dict__ +func.__dict__ = None +\end{verbatim} \subsubsection{Methods \label{typesmethods}} \obindex{method} @@ -1007,14 +1017,13 @@ object must be passed as the first argument. In this case, \code{self} must be an instance of the unbound method's class (or a subclass of that class), otherwise a \code{TypeError} is raised. -Like function objects, methods objects support getting and setting -arbitrary attributes. However, the attributes are actually stored on -the underlying function object (i.e. \code{meth.im_func}). To avoid -surprising behavior, a \code{TypeError} is raised when an attempt is -made to set an attribute on a bound method. It is legal to get a -bound method's attribute (the underlying function's attribute is -returned), and it is also legal to set or get an unbound method's -attribute. For example: +Like function objects, methods objects support getting +arbitrary attributes. However, since method attributes are actually +stored on the underlying function object (i.e. \code{meth.im_func}), +setting method attributes on either bound or unbound methods is +disallowed. Attempting to set a method attribute results in a +\code{TypeError} being raised. In order to set a method attribute, +you need to explicitly set it on the underlying function object: \begin{verbatim} class C: @@ -1022,14 +1031,9 @@ class C: pass c = C() -d = C() -c.method.whoami = 'my name is c' -d.method.whoami = 'my name is d' +c.method.im_func.whoami = 'my name is c' \end{verbatim} -If bound method attribute setting was allowed, \code{c.method.whoami} -would return ``my name is d''. - See the \citetitle[../ref/ref.html]{Python Reference Manual} for more information. |