For programs written in a functional style, it can be useful to

construct variants of existing functions that have some of the

parameters filled in. Consider a Python function \code{f(a, b, c)};

you could create a new function \code{g(b, c)} that was equivalent to

\code{f(1, b, c)}. This is called ``partial function application'',

and is provided by the \class{partial} class in the new

\module{functional} module.

The constructor for \class{partial} takes the arguments

\code{(\var{function}, \var{arg1}, \var{arg2}, ...

\var{kwarg1}=\var{value1}, \var{kwarg2}=\var{value2})}. The resulting

object is callable, so you can just call it to invoke \var{function}

with the filled-in arguments.

Here's a small but realistic example:

\begin{verbatim}

\end{verbatim}

Here's another example, from a program that uses PyGTk.