Constructor Injection in Python - possibly the wrong way

    # Business and Data Objects
    class Foo:
        def __init__(self,create_bar,prefix):
            self.create_bar = create_bar
            self.prefix = prefix
        def do_stuff(self,times):
            for _ in range(times):
                bar = self.create_bar(self.prefix)
                print bar

    class Bar:
        def __init__(self,prefix):
            self.prefix = prefix
        def __str__(self):
            return str(self.prefix)+"Hello"

    class Prefix:
        def __init__(self,name):
            self.name = name
            self.count = 0
        def __str__(self):
            self.count +=1
            return self.name+" "+str(self.count)+": "

    # Wiring up dependencies
    def create_bar(prefix):
        return Bar(prefix)


    def create_prefix(name):
        return Prefix(name)


    def create_foo(name):
        return Foo(create_bar,create_prefix(name))

    # Starting the application
    f1 = create_foo("foo1")
    f2 = create_foo("foo2")
    f1.do_stuff(3)
    f2.do_stuff(2)
    f1.do_stuff(2)