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Describe the new semantics for setting and deleting a function's 

__dict__ attribute.  Deleting it, or setting it to a non-dictionary
result in a TypeError.  Note that getting it the first time magically
initializes it to an empty dict so that func.__dict__ will always
appear to be a dictionary (never None).

Closes SF bug #446645.
This commit is contained in:
Barry Warsaw 2001-08-14 18:22:24 +00:00
parent 680cabb225
commit 5ef99a0bc5
1 changed files with 5 additions and 10 deletions
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15
Doc/lib/libstdtypes.tex
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@ -1047,19 +1047,14 @@ Function objects also support getting and setting arbitrary
attributes, which can be used to, e.g. attach metadata to functions.
Regular attribute dot-notation is used to get and set such
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.}
function attributes on user-defined functions. Function attributes on
built-in functions 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}
support function attributes. \code{__dict__} and \code{func_dict} can
be accessed directly or set to a dictionary object. A function's
dictionary cannot be deleted.
\subsubsection{Methods \label{typesmethods}}
\obindex{method}