Python9-面对对象2-day23

#计算正方形的周长和面积
class Square:
    def __init__(self,side_len):
        self.side_len = side_len
    def perimeter(self):
        return  self.side_len*4
    def area(self):
        return self.side_len **2
s = Square(5)
print(s.perimeter())
print(s.area())

命名空间

class Course:
    language = 'Chinese'
    def __init__(self,teacher,course_name,period,price):
        self.teacher  = teacher
        self.name = course_name
        self.period = period
        self.price = price

python = Course('egon','python','6 months',20000)
Course.language = 'English'   #对类里的静态属性进行修改
# Course.__dict__['language'] = 'Chinese'
# print(Course.language)
print(python.language)

#类中的静态变量，可以被对象和类调用
#对于不可变数据类型，类变量最好用类操作，而不应该用对象名操作
#对于可变数据类型，修改是共享的，重新赋值是独立的

class Course:
    language = 'Chinese'
    def __init__(self,teacher,course_name,period,price):
        self.teacher  = teacher
        self.name = course_name
        self.period = period
        self.price = price

python = Course('egon','python','6 months',20000)
linux = Course('oldboy','python','6 months',20000)
Course.language = 'English'   #对类里的静态属性进行修改
# Course.__dict__['language'] = 'Chinese'
# print(Course.language)
# print(python.language)
# print(linux.language)
python.language = 'go-lang'

#类中的静态变量，可以被对象和类调用
#对于不可变数据类型，类变量最好用类操作，而不应该用对象名操作
#对于可变数据类型，修改是共享的，重新赋值是独立的

print(python.language) print(Course.language) print(linux.language)

go-lang
English
English

#类中的静态变量，可以被对象和类调用
#对于不可变数据类型，类变量最好用类操作，而不应该用对象名操作

python.language = 'Chinese'
del python.language

 

class Course:
    language = ['English']
    def __init__(self,teacher,course_name,period,price):
        self.teacher  = teacher
        self.name = course_name
        self.period = period
        self.price = price

python = Course('egon','python','6 months',20000)
linux = Course('oldboy','python','6 months',20000)
# Course.language = 'Chinese'   #对类里的静态属性进行修改
# Course.__dict__['language'] = 'Chinese'
# print(Course.language)
# print(python.language)
# print(linux.language)
python.language[0] = 'Chinese'
# del python.language

#类中的静态变量，可以被对象和类调用
#对于不可变数据类型，类变量最好用类操作，而不应该用对象名操作
#对于可变数据类型，修改是共享的，重新赋值是独立的

print(python.language)
print(Course.language)
print(linux.language)


['Chinese']
['Chinese']
['Chinese']

class Course:
    language = ['English']
    def __init__(self,teacher,course_name,period,price):
        self.teacher  = teacher
        self.name = course_name
        self.period = period
        self.price = price

python = Course('egon','python','6 months',20000)
linux = Course('oldboy','python','6 months',20000)
# Course.language = 'Chinese'   #对类里的静态属性进行修改
# Course.__dict__['language'] = 'Chinese'
# print(Course.language)
# print(python.language)
# print(linux.language)
python.language = ['Chinese']
# del python.language

#类中的静态变量，可以被对象和类调用
#对于不可变数据类型，类变量最好用类操作，而不应该用对象名操作
#对于可变数据类型，修改是共享的，重新赋值是独立的

print(python.language)
print(Course.language)
print(linux.language)


['Chinese']
['English']
['English']

 

 

 

#面向对象的三大特性：继承，多态和封装
#组合

class Dog:
    def __init__(self,name,aggr,hp,kind):
        self.name =name
        self.aggr = aggr
        self.hp =hp
        self.kind =kind
    def bite(self,persion):
        persion.hp -= self.aggr
class Person:
    def __init__(self,name,aggr,hp,sex):
        self.name =name
        self.aggr = aggr
        self.hp =hp
        self.sex =sex
        self.money = 0
    def attack(self,dog):
        dog.hp -= self.aggr
    def get_weapon(self,weapon):
        if self.money >= weapon.price:
            self.money -= weapon.price
            self.weapon = weapon
            self.aggr += weapon.aggr
        else:
            print('余额不足，请先充值')

class Weapon:
    def __init__(self,name,aggr,njd,price):
        self.name = name
        self.aggr = aggr
        self.njd = njd
        self.price = price

    def hand18(self,person):
        if self.njd >0:
            person.hp -= self.aggr * 2
            self.njd -= 1

w = Weapon('打狗棒',100,3,998)
alex = Person('alex',0.5,100,'不详')
jin = Dog('金老板',100,500,'不详')
alex.money += 1000
alex.get_weapon(w)
print(alex.weapon)
print(alex.aggr)
alex.attack(jin)
print(jin.hp)
alex.weapon.hand18(jin)
print(jin.hp)
# 组合：一个对象的属性值是另一个类的对象
#         alex.weapon是 Weapon类的一个对象