你知道Java的重写与重载，在Python中该如何实现吗？

# 类的重载
class Person:
    def __init__(self, age, sex):
        self._age = age
        self._sex = sex
    def say(self):
        print("欢迎关注 [清风Python] 公众号")
    def call(self):
        print("This Person age {_age},sex {_sex}".format(**self.__dict__))
class WangPangZi(Person):
    def __init__(self, name, age, sex):
        super().__init__(age, sex)
        self._name = name
    def call(self):
        print("This Person name {_name},age {_age},sex {_sex}".format(**self.__dict__))
P= Person(18, '女')
P.call()
W = WangPangZi('王胖子', 30, '男')
W.call()
W.say()
output:
This Person age 18,sex 女
This Person name 王胖子,age 30,sex 男
欢迎关注 [清风Python] 公众号

class NewList:
    def __init__(self, *args):
        self._list = []
        for i in args:
            self._list.append(i)
    def __add__(self, other):
        self._list = [i + other for i in self._list]
    def call(self):
        print(self._list)
N = NewList(1, 2, 3, 4, 5)
N + 10
N.call()
output：
[11, 12, 13, 14, 15]

def eg1(name, hobby='Python'):
    print("{}的是{}开发".format(name, hobby))
eg1('老王')
eg1('老张', 'Java')
output:
老王的是Python开发
老张的是Java开发

from functools import singledispatch
@singledispatch
def shop(price):
    pass
@shop.register(int)
def int_price(price):
    print('获取整数单价%s' % price)
@shop.register(float)
def float_price(price):
    print('获取小数单价%s' % price)
if __name__ == '__main__':
    shop(100)
    shop(99.8)
output:
获取整数单价100
获取小数单价99.8