python基礎6_2-類的繼承

繼承：可以使用現有類的所有功能，並在無需重新編寫原來的類的情況下對這些功能進行擴展

通過繼承創建的新類稱爲“子類”或“派生類”

被繼承的類稱爲“基類”、“父類”或“超類”

1、知識點

# Author: Mr.Xue
# 2019.10.29

# class People: # 經典類
class People(object): # 新式類
	
	def __init__(self, name, age):
		self.name = name
		self.age = age
		self.friends = []
		
	def eat(self):
		print("%s is eating..." % self.name)
		
	def sleep(self):
		print("%s is sleeping..." % self.name)
		
	def talk(self):
		print("%s is talking..." % self.name)
		
class Relation(object):
	
	def make_friends(self, obj):
		print("%s is making friends with %s" % (self.name, obj.name))
		self.friends.append(obj)
		
class Man(People, Relation):
	
	def __init__(self, name, age, money): # 對構造函數進行重構
		#People.__init__(self, name, age) # 經典類的寫法
		super(Man, self).__init__(name, age) # 新式類的寫法，和上面的語句效果相同
		self.money = money
		print("%s have $%s" % (self.name, self.money))
	
	def swim(self):
		print("%s is swiming..." % self.name)
		
	def sleep(self): #重構父類的方法
		People.sleep(self) # 先調用父類的方法
		print("man is sleeping...")
	
class Woman(People, Relation):
	
	def get_birth(self):
		print("%s is born a baby...")		
		
m = Man('Bob', 23, 10)
#m.swim()
#m.sleep()

w = Woman("John", 24)

m.make_friends(w)

w.name = "xue"
print(m.friends[0].name)						

2、實例：學校、學生、老師

# Author: Mr.Xue
# 2091.10.27
#!_*_coding=utf-8_*_

class School(object):
	def __init__(self, name, addr):
		self.name = name
		self.addr = addr
		self.students = []
		self.staffs = []
		
	def enroll(self, stu_obj):
		print("爲學員%s辦理註冊手續" % stu_obj.name)
		self.students.append(stu_obj)
		
	def hire(self, staff_obj):
		print("僱傭%s" % staff_obj.name)
		self.staffs.append(staff_obj)
		
class SchoolMember(object):
	def __init__(self, name, age, sex):
		self.name = name
		self.age = age
		self.sex = sex
		
	def tell(self):
		pass
		
class Teacher(SchoolMember):
	def __init__(self, name, age, sex, salary, course):
		super(Teacher, self).__init__(name, age, sex)
		self.salary = salary
		self.course = course
		
	def tell(self):
		print("""
		--- info of Teacher:
		Name: %s
		Age: %s
		Sex: %s
		Salary: %s
		Course: %s
		""" % (self.name, self.age, self.sex, self.salary, self.course))
		
	def teach(self):
		print("%s is teaching course[%s]" % (self.name, self.course))	
		
class Student(SchoolMember):
	def __init__(self, name, age, sex, stu_id, grade):
		super(Student, self).__init__(name, age, sex)
		self.stu_id = stu_id
		self.grade = grade
		
	def tell(self):
		print("""
		--- info of Student:
		Name: %s
		Age: %s
		Sex: %s
		Stu_id: %s
		Grade: %s
		""" % (self.name, self.age, self.sex, self.stu_id, self.grade))	
		
	def pay_tuition(self, tuition):
		print("%s paid tuition $%s" % (self.name, tuition))
		
school1 = School('School1', 'ningbo')

t1 = Teacher('t1', 33, 'M', 5000, 'Python')
t2 = Teacher('t2', 34, 'F', 6000, 'C')

s1 = Student("s1", 18, 'F', 1001, 3)
s2 = Student("s2", 19, 'M', 1002, 4)

t1.tell()
s1.tell()
school1.hire(t1)
school1.enroll(s1)
school1.enroll(s2)
print(school1.staffs)
print(school1.students)
school1.staffs[0].teach()
for stu in school1.students:
	stu.pay_tuition(4000)