binding more than one attribute in a facntion

faulkner faulkner612 at comcast.net
Wed Jul 26 16:01:55 EDT 2006

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Peter Otten wrote:
> linuxnow at gmail.com wrote:
>
> > I want to have a bound method that "fixes" more than one parmeter of a
> > funtion. LEt me post an example.
> >
> > def f(a, b, c):
> >     return a + b + c
> >
> > I can do:
> > fplus10 = f(10)
> > and then call f with 2 params and it works.
> >
> > But, how can I fix 2 params:
> > fplus10plus20 = f(10,20)
> > ignores the second param.
> >
> > fplus10plus20= fplus10(20)
> > does not work either.
> >
> > Can anybody show what I'm doing wrong?
>
> Bound methods are limited to one implicit parameter. What you need is
> partial function application:
>
> >>> def f(a, b, c):
> ...     return a + b + c
> ...
> >>> def partial(f, *args):
> ...     def g(*more):
> ...             return f(*args+more)
> ...     return g
> ...
> >>> partial(f, 1, 2)(3)
> 6
> >>> partial(f, 1)(2, 3)
> 6
> >>> partial(f)(1, 2, 3)
> 6
> 
> See http://www.python.org/dev/peps/pep-0309/ for more.
> 
> Peter

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