Code: Alles auswählen
In [1]: class Size(object):
...: def __init__(self):
...: self.size = 0
...: def add(self, number):
...: return self.size + number
...:
In [2]: size = Size()
In [3]: size.add(23)
Out[3]: 23
In [4]: size.add(42)
Out[4]: 65