# objects.py

# code block # 1
>>> age = 42
>>> age
42
>>> age = 43  #A
>>> age
43


# code block # 2
>>> age = 42
>>> id(age)
4377553168
>>> age = 43
>>> id(age)
4377553200


# code block # 3
>>> class Person:
...     def __init__(self, age):
...         self.age = age
...
>>> fab = Person(age=42)
>>> fab.age
42
>>> id(fab)
4380878496
>>> id(fab.age)
4377553168
>>> fab.age = 25  # I wish!
>>> id(fab)  # will be the same
4380878496
>>> id(fab.age)  # will be different
4377552624