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. -- http://mail.python.org/mailman/listinfo/python-list
