new python syntax: concatenation of functions

[Daniel Dittmar]

Radovan Garabik wrote:
> or, without leaving ascii:
>
> def (x)composition(y):
>     return lambda par: x(y(par))
> print (a composition b)(x)

or without leaving Python

class Composition:
    def __init__ (self, outer, inner):
        self.outer = outer
        self.inner = inner

    def __call__ (self, *args):
        return self.outer (self.inner (*args))

    def __str__ (self):
        return '%s ° %s' % (self.outer, self.inner)

Daniel