python中的海龟动画非常快

Question

我造了风车，但它跑得太快了。我使用turtle库来实现这一点，并且t2仅用于循环，t进行主要工作。我使用了tracer/update，我在tracer中尝试了一些数字，但没有任何变化。如何以正常速度制作动画

import turtle
screen = turtle.Screen()
screen.tracer(0)         
t2 = turtle.Turtle()
t2.speed(2)
t2.forward(50)
t2.setheading(90)
t2.circle(50)
t = turtle.Turtle()
t.speed(2)
def rectangle() :
    t.penup()
    t.forward(170)
    t.left(90)
    t.pendown()
    t.forward(5)
    t.left(90)
    t.forward(120)
    t.left(90)
    t.forward(10)
    t.left(90)
    t.forward(120)
    t.left(90)
    t.forward(5)
def windmill():
    for i in range(4):
        rectangle()
        t.penup()
        t.goto(0,0)
        t.pendown()
while True:
    t.clear()
    windmill()
    screen.update()
    t.left(10)

Answer 1

您可以使用内置time模块中的sleep方法：

import turtle
from time import sleep # Imported here

screen = turtle.Screen()
screen.tracer(0)         
t2 = turtle.Turtle()
t2.forward(50)
t2.setheading(90)
t2.circle(50)
t = turtle.Turtle()
def rectangle() :
    t.penup()
    t.forward(170)
    t.left(90)
    t.pendown()
    t.forward(5)
    t.left(90)
    t.forward(120)
    t.left(90)
    t.forward(10)
    t.left(90)
    t.forward(120)
    t.left(90)
    t.forward(5)
def windmill():
    for i in range(4):
        rectangle()
        t.penup()
        t.goto(0,0)
        t.pendown()
while True:
    sleep(0.05) # Used here
    t.clear()
    windmill()
    screen.update()
    t.left(10)

一种更平滑的方法是减少while循环每次迭代的left量：

import turtle

screen = turtle.Screen()
screen.tracer(0)         
t2 = turtle.Turtle()
t2.forward(50)
t2.setheading(90)
t2.circle(50)
t2.speed(2)
t = turtle.Turtle()
t.speed(2)
def rectangle() :
    t.penup()
    t.forward(170)
    t.left(90)
    t.pendown()
    t.forward(5)
    t.left(90)
    t.forward(120)
    t.left(90)
    t.forward(10)
    t.left(90)
    t.forward(120)
    t.left(90)
    t.forward(5)
def windmill():
    for i in range(4):
        rectangle()
        t.penup()
        t.goto(0,0)
        t.pendown()
while True:
    t.clear()
    windmill()
    screen.update()
    t.left(0.2) # Reduced here!