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| -rw-r--r-- | Doc/ref/ref3.tex | 20 |
1 files changed, 11 insertions, 9 deletions
diff --git a/Doc/ref/ref3.tex b/Doc/ref/ref3.tex index c51f514..59b98de 100644 --- a/Doc/ref/ref3.tex +++ b/Doc/ref/ref3.tex @@ -438,11 +438,12 @@ base class of the class of which \member{im_self} is an instance); User-defined method objects are created in two ways: when getting an attribute of a class that is a user-defined function object, or when -getting an attributes of a class instance that is a user-defined -function object. In the former case (class attribute), the -\member{im_self} attribute is \code{None}, and the method object is said -to be unbound; in the latter case (instance attribute), \method{im_self} -is the instance, and the method object is said to be bound. For +getting an attribute of a class instance that is a user-defined +function object defined by the class of the instance. In the former +case (class attribute), the \member{im_self} attribute is \code{None}, +and the method object is said to be unbound; in the latter case +(instance attribute), \method{im_self} is the instance, and the method +object is said to be bound. For instance, when \class{C} is a class which contains a definition for a function \method{f()}, \code{C.f} does not yield the function object \code{f}; rather, it yields an unbound method object \code{m} where @@ -452,9 +453,7 @@ instance, \code{x.f} yields a bound method object \code{m} where \code{m.im_class} is \code{C}, \code{m.im_func} is \method{f()}, and \code{m.im_self} is \code{x}. \withsubitem{(method attribute)}{ - \ttindex{im_class} - \ttindex{im_func} - \ttindex{im_self}} + \ttindex{im_class}\ttindex{im_func}\ttindex{im_self}} When an unbound user-defined method object is called, the underlying function (\member{im_func}) is called, with the restriction that the @@ -474,7 +473,10 @@ the class or instance. In some cases, a fruitful optimization is to assign the attribute to a local variable and call that local variable. Also notice that this transformation only happens for user-defined functions; other callable objects (and all non-callable objects) are -retrieved without transformation. +retrieved without transformation. It is also important to note that +user-defined functions which are attributes of a class instance are +not converted to bound methods; this \emph{only} happens when the +function is an attribute of the class. \item[Built-in functions] A built-in function object is a wrapper around a \C{} function. Examples |