python: delattr函数

class Person:
    def __init__(self, name, age):
        self.name = name
        self.age = age

tom = Person("Tom", 35)
print dir(tom)
delattr(tom, "age")
print dir(tom)

['__doc__', '__init__', '__module__', 'age', 'name']
['__doc__', '__init__', '__module__', 'name']