Environmental preparation

Running platform. Windows 7 Signature Edition

python Version.python 3.6.4

IDE： Python comes with IDLE

1、Drawing principle

If the equation of the parabola is: , and the point P is on the parabola, then the equation of the tangent to the parabola through the point P is.

2. Drawing a parabola

importturtleast

t.pencolor("red")

t.speed(1)

a=1

forxinrange(30):

a+=0.2

t.left(2)

t.forward(a)

t.penup()# no drawing when moving

t.goto(0,0)# return to the origin

t.pendown()# by default also draws the graph

t.left(120)# because the previous has been cumulatively rotated by 60 degrees

b=1

forxinrange(30):

b+=0.2

t.right(2)

t.forward(b)

t.mainloop()

Results of the run.

——The End ——

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