Some examples.

1、

         Exchange rate conversion procedure . According to the design idea of temperature conversion program , according to  1 dollar =6  RMB remittance
         Write a two-way exchange program between US dollars and RMB .

MoneyStr = input(" Please enter the amount with the symbol ：")
if MoneyStr[-1] in [' dollar ','d']:
    C = (eval(MoneyStr[0:-1]) ) * 6
    print(" The amount converted into RMB is {:.2f} RMB " .format(C))
elif MoneyStr[-1] in [' RMB ',' element ']:
    F = eval(MoneyStr[0:-1] ) / 6
    print(" The temperature after conversion is {:.2f} dollar " .format(F))
else:
    print(" Input format error ")

2、
         example 2 Modification of . Transformation instance code  2.1, Draw a colored python , That is, when drawing  Python
         Each segment of a python , The paint color of the brush will change .
         Tips ： Put the brush color control function near the python drawing function .

#a2.3DrawPython.py
import turtle
turtle.setup(650,350,200,200)
turtle.penup()
turtle.fd(-250)
turtle.pendown()
turtle.pensize(25)
turtle.pencolor("green")
turtle.seth(-40)
for i in range(4):
    turtle.circle(40,80)
    turtle.pencolor("purple")
    turtle.circle(-40,80)
    turtle.pencolor("yellow")
turtle.pencolor("black")
turtle.circle(40, 80/2)
turtle.fd(40)
turtle.circle(16,180)
turtle.fd(40 * 2/3)

3、

 

         Drawing of equilateral triangle . Use  turtle  In the library  turtle.fd0 Sum of two numbers  turtle.setho Function drawing
         Make an equilateral triangle , The effect is shown in the figure .

#e2.1DrawTriangle.py
import turtle
turtle.setup(650,550,2,100)
turtle.fd(250)
turtle.penup()
turtle.seth(120)
turtle.pendown()
turtle.fd(250)
turtle.penup()
turtle.seth(-120)
turtle.pendown()
turtle.fd(250)

4、
         Drawing of superimposed equilateral triangles . Use  turtle  In the library turtle.fd0 Functions and  turtle.seth0 Letter
         Number to draw a superimposed equilateral triangle , The effect is shown in the figure .

#e2.5DrawTriangle.py
import turtle
turtle.setup(650,550,2,100)
turtle.fd(200)
turtle.seth(120)
turtle.fd(200)
turtle.seth(-120)
turtle.fd(100)
turtle.seth(0)
turtle.fd(100)
turtle.seth(-120)
turtle.fd(100)
turtle.seth(120)
turtle.fd(100)
turtle.seth(-120)
turtle.fd(100)

 

5、

Drawing of a square without corners . utilize  turtle  The library function draws a square without corners , The effect is like
As shown in the figure .

#e2.6DrawSquare.py
import turtle
turtle.setup(600,820,2,100)
turtle.fd(200)
turtle.penup()
turtle.fd(60)
turtle.seth(90)
turtle.fd(60)
turtle.pendown()
turtle.fd(200)

turtle.penup()
turtle.fd(60)
turtle.seth(180)
turtle.fd(60)
turtle.pendown()
turtle.fd(200)

turtle.penup()
turtle.fd(60)
turtle.seth(270)
turtle.fd(60)
turtle.pendown()
turtle.fd(200)

6、

 

Drawing of hexagon . utilize  turtle  Library draw a hexagon , The effect is shown in the figure .

 

import turtle 
turtle.setup(650,400,200,200)    
turtle.seth(30)                  # The starting direction of the brush 
for i in range(6):
    turtle.fd(60)                # Hexagonal side length 30
    turtle.left(120)             # Move counterclockwise 120 degree 
    turtle.fd(60)
    turtle.left(120)
    turtle.fd(60)
    turtle.left(120)             # Draw a triangle 
    turtle.fd(60)
    turtle.right(60)             # Change direction , Start preparing new triangles 

7、

Drawing of square helix . utilize turtle Library draw a square helix , The effect is as shown in the picture .

 

import turtle 
turtle.setup(650,400,200,200)    
turtle.seth(90)                  # The starting direction of the brush 
a=0
for i in range(25):
    a = a+5
    turtle.fd(a)                
    turtle.left(90)             
    turtle.fd(a+5)
    turtle.left(90)
    turtle.fd(a+5)
    turtle.left(90)             
    
    turtle.fd(a+10)
    turtle.left(90)             
    a = a+5