【Python】用turtle库画数学函数图像

希望哪位大佬能帮写一下代码，能解释一下就更好了 🙏🙏

实在不行也希望可以提供一下思路 🙏🙏

你可以参考这个利用python的标准库turtle画正弦函数

#coding:utf-8
import math
import turtle

# draw a line from (x1, y1) to (x2, y2)
def drawLine (ttl, x1, y1, x2, y2):
    ttl.penup()
    ttl.goto (x1, y1)
    ttl.pendown()
    ttl.goto (x2, y2)
    ttl.penup()

# write label at location x, y
def labelPoint (ttl, x, y, label):
    ttl.penup()
    ttl.goto (x, y)
    ttl.pendown()
    ttl.write (label)
    ttl.penup()

def drawGridMark (ttl, x, y, isVertical):
    if isVertical :
        drawLine (ttl, x, y + 5, x, y - 5)
    else:
        drawLine (ttl, x - 5, y, x + 5, y)

def labelGridPoint (ttl, x, y, isVertical, text):
    if isVertical:
        labelPoint (ttl, x - 20, y - 20, text)
    else:
        labelPoint (ttl, x + 20, y, text)

def drawGridScaled (ttl):
  # draw the axes
    drawLine (ttl, -400, 0, 400, 0)
    drawLine (ttl, 0, 400, 0, -400)

    # label the x axis
    for x in [-300, -200, -100, 100, 200, 300]:
        drawGridMark (ttl, x, 0, True)
        labelGridPoint (ttl, x, 0, True, (x/100, 0))

    # label the y axis
    for y in [-300, -200, -100, 100, 200, 300]:
        drawGridMark (ttl, 0, y, False)
        labelGridPoint (ttl, 0, y, False, (0, y/100))

def drawFnScaled (ttl, fn, lower, upper, step):
    ttl.penup()
    x = lower
    y = fn (x)
    scaledX = x * 100
    scaledY = y * 100
    ttl.goto (scaledX, scaledY)
    ttl.pendown()
    while x < upper:
        x = x + step
        y = fn ( x )
        scaledX, scaledY = x * 100, y * 100
        ttl.goto (scaledX, scaledY)
    ttl.penup()

def myFunc (x):
    return (x ** 2 - 4)

def  main():
    # put label on top of page
    turtle.title ('Graphs of Functions')

    # setup screen size
    turtle.setup (800, 800, 0, 0)

    # create a turtle object
    ttl = turtle.Turtle()

    # draw the grid
    drawGridScaled (ttl)

    # draw sine finction
    ttl.pencolor ('red')
    drawFnScaled (ttl, math.sin, -math.pi, math.pi, 0.01)


    # persist drawing
    turtle.done()

if __name__ == "__main__":
    main()

如有帮助，望采纳！谢谢!