@property decorator can be used to define methods in a class which act like attributes. One example where this can be useful is when exposing information which may require an initial (expensive) lookup and simple retrieval thereafter.
Given some module
class Foo(object): def __init__(self): self.__bar = None @property def bar(self): if self.__bar is None: self.__bar = some_expensive_lookup_operation() return self.__bar
>>> from foobar import Foo >>> foo = Foo() >>> print(foo.bar) # This will take some time since bar is None after initialization 42 >>> print(foo.bar) # This is much faster since bar has a value now 42