On Feb 3, 5:09 am, Kay Schluehr <[EMAIL PROTECTED]> wrote: > As you know, there is no operator for function composition in Python. > When you have two functions F and G and want to express the > composition F o G you have to create a new closure > > lambda *args, **kwd: F (G (*args, **kwd)) > > or you write a composition in functional style > > compose( F, G ) > > None of these solutions is particular terse. > > Proposal > ------------- > I want to propose overloading the logical __and__ operator i.e. '&' > for functions s.t. F & G means "compose(F,G)". This suggestion is non- > conflicting since & is not used as an operator in combination with > function objects yet: given a function object F and an arbitrary > object X the combination F & X raises a TypeError when evaluated. > > Alternatives > ----------------- > One could use other unused operators like F << G or F * G to write > terse function composition expressions. I' m not sure which one is > best and would use the proposed & if no one presents arguments against > it.
What about other callable objects? -- Arnaud -- http://mail.python.org/mailman/listinfo/python-list
