Can a method in one class change an object in another class?

[Harlin Seritt]

Here's what I came up with:

#objtest.py


class first:
    def __init__(self):
        a = 'a'
        self.a = a
        print self.a


    def update(self):
        print 'initially, a is', self.a
        self.a = second(self.a)
        print 'afterwards, a is', self.a.call(self.a)


class second:
    def __init__(self, a):
        pass


    def call(self, a):
        a = 'aa'
        return a


if __name__ == '__main__':
    app = first()
    app.update() 

Not sure if this is what you are wanting though.