'Emits the Python source for this node.'

def emit(self):

    args = map(self.format, self.args)
    if self.kwargs:
        args += [self.pair(k, v) for (k, v) in self.kwargs]
    args.append(self.pair('name', self.node.name))
    args = ',    '.join(args)
    return ('%s(%s)' % (self.op, args))
