封装步骤：
1.属性私有化，---》__name
2.设置set和get方法，--->set_name(),get_name()
3.添加安全条件判断，---》参数类型判断，取值范围判断
"""
class Dog(
object):
def __init__(
self, legnum):
self.__legnum = legnum
def set_legnum(
self, legnum):
if legnum <
0 or legnum >
4:
print(
'无耻')
return
self.__legnum = legnum
def get_legnum(
self, str1):
if str1 ==
'ok':
return self.__legnum
else:
print(
'答案不对，请重新输入')
wangcai = Dog(
4)
print(wangcai._Dog__legnum)
"""
继承：子类继承父类的成员
子类可以直接调用父类中的属性和方法
"""
class Person(
object):
def __init__(
self, name):
print(
'第二个重载的构造方法')
self.name = name
self.age =
20
pass
def __add__(
self, other):
p = Person(
'')
p.name =
self.name + other.name
return p
def __mul__(
self, other):
p = Person(
'')
p.name =
self.name * other
return p
def __str__(self):
return '{},{}'.format(self.name, self.age)
def __len__(
self):
return len(
self.name)
per = Person(
'jack')
per2 = Person(
'tom')
print(per+per2)
print((per.
__mul__(
2)))
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