1.聲明一個(gè)電腦類(lèi): 屬性:品牌、顏色犁苏、內(nèi)存大小 方法:打游戲扩所、寫(xiě)代碼、看視頻
a.創(chuàng)建電腦類(lèi)的對(duì)象短曾，然后通過(guò)對(duì)象點(diǎn)的方式獲取、修改嫉拐、添加和刪除它的屬性
class Computer:
__slots__ = ('brand', 'color', 'memory_size', 'price')
def __init__(self, brand='Dell', color='black', memory_size='2G'):
self.brand = brand
self.color = color
self.memory_size = memory_size
def play_game(self):
pass
def write_code(self):
pass
def watch_movie(self):
pass
my_dell = Computer(color='red')
# a.創(chuàng)建電腦類(lèi)的對(duì)象，然后通過(guò)對(duì)象點(diǎn)的方式獲取漠嵌、修改盖呼、添加和刪除它的屬性
# “對(duì)象.屬性”獲取屬性
print(my_dell.brand, my_dell.color, my_dell.memory_size)
# “對(duì)象.屬性”修改屬性
my_dell.brand = 'Lenovo'
print(my_dell.brand)
# “對(duì)象.屬性”添加屬性
my_dell.price = 21999
print(my_dell.price)
# “對(duì)象.屬性”刪除屬性
del my_dell.memory_size
# print(my_dell.memory_size) # AttributeError: memory_size
b.通過(guò)attr相關(guān)方法去獲取、修改几晤、添加和刪除它的屬性
class Computer:
__slots__ = ('brand', 'color', 'memory_size', 'price')
def __init__(self, brand='Dell', color='black', memory_size='2G'):
self.brand = brand
self.color = color
self.memory_size = memory_size
def play_game(self):
pass
def write_code(self):
pass
def watch_movie(self):
pass
my_dell = Computer(color='red')
# b.通過(guò)attr相關(guān)方法去獲取蟹瘾、修改、添加和刪除它的屬性
# “getattr(對(duì)象, 屬性)”獲取屬性
print(getattr(my_dell, "brand"), getattr(my_dell, "color"), getattr(my_dell, "memory_size"))
# “setattr(對(duì)象, 屬性)”修改屬性
setattr(my_dell, "brand", "Lenovo")
print(my_dell.brand)
# “setattr(對(duì)象, 屬性)”添加屬性
setattr(my_dell, "price", 21999)
print(my_dell.price)
# “delattr”刪除屬性
delattr(my_dell, 'memory_size')
# print(my_dell.memory_size) # AttributeError: memory_size
2.聲明一個(gè)人的類(lèi)和狗的類(lèi):
狗的屬性:名字狸捕、顏色众雷、年齡
狗的方法:叫喚
人的屬性:名字、年齡砾省、狗
人的方法:遛狗
a.創(chuàng)建人的對(duì)象小明，讓他擁有一條狗大黃纤房，然后讓小明去遛大黃
class Person:
__slots__ = ('name', 'age', 'dog')
def __init__(self, name, age=18, dog=Dog):
self.name = name
self.age = age
self.dog = dog
def walk_dogs(self):
print('{}帶著{}去遛彎...'.format(self.name, self.dog.name))
print('當(dāng){}呼喚{}時(shí)翻诉，{}會(huì)"{}"叫'.format(self.name, self.dog.name, self.dog.name, self.dog))
class Dog:
__slots__ = ('name', 'color', 'age')
def __init__(self, name, color, age):
self.name = name
self.color = color
self.age = age
def __str__(self):
return '汪汪汪'
dog1 = Dog('大黃', 'yellow', 5)
p1 = Person('小明', 22, dog1)
p1.walk_dogs()
"""
小明帶著大黃去遛彎...
當(dāng)小明呼喚大黃時(shí)碰煌，大黃會(huì)"汪汪汪"叫
"""
class Dog:
__slots__ = ('name', 'age', 'color')
def __init__(self, name, color, age=0):
self.name = name
self.age = age
self.color = color
def call_out(self):
print('%s：嗷嗷叫！' % self.name)
class Person:
__slots__ = ('name', 'age', 'dog')
def __init__(self, name: str, age=0, dog=None):
self.name = name
self.age = age
self.dog = dog
def walk_the_dog(self):
if self.dog:
print('%s牽著%s散步芦圾！' % (self.name, self.dog.name))
self.dog.call_out()
else:
print('沒(méi)有狗个少！自己遛自己洪乍！')
dog1 = Dog('大黃', '黃色')
p1 = Person('小明', dog=dog1)
p1.walk_the_dog()
"""
小明牽著大黃散步壳澳！
大黃：嗷嗷叫茫经！
"""
3.聲明一個(gè)圓類(lèi)，自己確定有哪些屬性和方法
from math import pi as PI
class Circle:
__slots__ = ('radius', '_area', '_girth')
def __init__(self, radius):
self.radius = radius
self._area = radius * radius * PI
self._girth = 2 * PI * radius
@property
def area(self):
return self._area
@property
def girth(self):
return self._girth
c1 = Circle(1)
print('%.3f' % c1.area)
print('%.3f' % c1.girth)
c1 = Circle(3)
print('%.3f' % c1.area)
print('%.3f' % c1.girth)
# 方法2
# 屬性：圓周率抹镊、半徑荤傲、圓心坐標(biāo)
# 方法：獲取面積、周長(zhǎng)
import math
class Point:
def __init__(self, x, y):
self.x = x
self.y = y
def distance(self, other):
a = self.x - other.x
b = self.y - other.y
return math.hypot(a, b)
class Circle:
pi = 3.1415926
def __init__(self, radius: float, center: Point):
self.radius = radius
self.center = center
def area(self):
return Circle.pi * self.radius ** 2
def perimeter(self):
return 2 * Circle.pi * self.radius
def is_intersect(self, other):
distance = self.center.distance(other.center)
add_r = self.radius + other.radius
sub_r = math.fbs(self.radius - other.radius)
if distance == add_r:
print('外切')
elif distance == sub_r:
print('內(nèi)切')
elif distance > add_r:
print('不相交')
elif sub_r < distance < add_r:
print('相交')
else:
print('包含關(guān)系')
p1 = Point(0, 0)
c1 = Circle(2, p1)
p2 = Point(1, 0)
c2 = Circle(2, p2)
c2.is_intersect(c1)
4.創(chuàng)建一個(gè)學(xué)生類(lèi):
屬性:姓名终佛，年齡妓湘，學(xué)號(hào)
方法:答到，展示學(xué)生信息
創(chuàng)建一個(gè)班級(jí)類(lèi):
屬性:學(xué)生豌研，班級(jí)名
方法:添加學(xué)生唬党，刪除學(xué)生，點(diǎn)名, 求班上學(xué)生的平均年齡
class Student:
__slots__ = ('name', 'age', 'study_id')
def __init__(self, name, age, study_id):
self.name = name
self.age = age
self.study_id = study_id
def answer(self):
print('到!', end='')
print('我叫{}驶拱，我{}歲，我的學(xué)號(hào)是{}'.format(self.name, self.age, self.study_id))
def __repr__(self):
return '{}-{}-{}'.format(self.name, self.age, self.study_id)
class Class:
__slots__ = ('students', 'class_name')
def __init__(self, class_name=None):
self.students = {}
self.class_name = class_name
def add_student(self, *args):
for arg in args:
self.students.update({arg: [arg.study_id, arg.name, arg.age]})
print('添加成功阴孟！')
def del_student(self, student):
del self.students[student]
print('刪除成功永丝！')
def ask_student(self, str1):
for student in self.students:
if str1 == student.name:
student.answer()
return
print('該學(xué)生不存在箭养！')
def average_age(self):
sum1 = sum(student.age for student in self.students)
return sum1 / len(self.students)
stu1 = Student('a1', 12, 'stu001')
stu2 = Student('a2', 13, 'stu002')
stu3 = Student('a3', 14, 'stu003')
class_math = Class('math')
class_math.add_student(stu1, stu2, stu3)
print(class_math.students)
class_math.del_student(stu3)
print(class_math.students)
class_math.ask_student('a1')
class_math.ask_student('a3')
aver_stu_age = class_math.average_age()
print('該班的學(xué)生的平均年齡是{}'.format(aver_stu_age))
