Python 中多态性的示例和类的继承多态性详解

x = "Hello World!"
print(len(x))

mytuple = ("apple", "banana", "cherry")
print(len(mytuple))

thisdict = {
  "brand": "Ford",
  "model": "Mustang",
  "year": 1964
}
print(len(thisdict))

class Car:
  def __init__(self, brand, model):
    self.brand = brand
    self.model = model
  def move(self):
    print("Drive!")
class Boat:
  def __init__(self, brand, model):
    self.brand = brand
    self.model = model
  def move(self):
    print("Sail!")
class Plane:
  def __init__(self, brand, model):
    self.brand = brand
    self.model = model
  def move(self):
    print("Fly!")
car1 = Car("Ford", "Mustang")       # 创建一个 Car 类
boat1 = Boat("Ibiza", "Touring 20") # 创建一个 Boat 类
plane1 = Plane("Boeing", "747")     # 创建一个 Plane 类
for x in (car1, boat1, plane1):
  x.move()

class Vehicle:
  def __init__(self, brand, model):
    self.brand = brand
    self.model = model
  def move(self):
    print("Move!")
class Car(Vehicle):
  pass
class Boat(Vehicle):
  def move(self):
    print("Sail!")
class Plane(Vehicle):
  def move(self):
    print("Fly!")
car1 = Car("Ford", "Mustang") # 创建一个 Car 对象
boat1 = Boat("Ibiza", "Touring 20") # 创建一个 Boat 对象
plane1 = Plane("Boeing", "747") # 创建一个 Plane 对象
for x in (car1, boat1, plane1):
  print(x.brand)
  print(x.model)
  x.move()