Showing some raw python, if there were no classes...

classless.py

## python without classes?

def newlist(items):
    def in_(item):
        return item in items
    
    def index(a):
        return items.index(a)
    
    def pretty():
        for x in items:
            print x
    
    # python needs the symbols defined
    # before we reference them
    methods = {
        'in_': in_,
        'index': index,
        'pretty': pretty,
    }
    return methods

L = newlist(['a','b','c','d'])
assert L['in_']('a') == True
assert L['index']('c') == 2