乌龟和乌龟的区别？

Question

python 2.7版中的turtle和Turtle有什么不同？

import turtle
star = turtle.Turtle()
for i in range(50):
    star.forward(50)
    star.right(144)
turtle.done()

Answer 1

海龟模块不寻常。为了让初学者更容易，Turtle 类的所有方法也可用作对默认（未命名）海龟实例进行操作的顶级函数。Screen 类的所有方法也可用作对默认（唯一）屏幕实例进行操作的顶级函数。所以这两个：

import turtle

star = turtle.Turtle()  # turtle instance creation

for i in range(5):
    star.forward(50)  # turtle instance method
    star.right(144)  # turtle instance method

screen = turtle.Screen()  # access sole screen instance
screen.mainloop()  # screen instance method

和这个：

import turtle

for i in range(5):
    turtle.forward(50)  # function, default turtle
    turtle.right(144)

turtle.done()  # function, mainloop() synonym, acts on singular screen instance

都是有效的实现。许多海龟程序最终将功能接口与对象接口混合在一起。为了避免这种情况，我强烈推荐以下导入语法：

from turtle import Turtle, Screen

这迫使对象方法使用乌龟，使函数方法不可用：

from turtle import Turtle, Screen

star = Turtle()  # turtle instance creation

for i in range(5):
    star.forward(50)  # turtle instance method
    star.right(144)  # turtle instance method

screen = Screen()  # access sole screen instance
screen.mainloop()  # screen instance method