# Python input and output exercises, arithmetic exercises, turtle preliminary exercises

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1.Hello world!

 1 `print``(``‘Hello World!‘``)`

Simple interaction (Interactive, file-style)

`1 name=input (' Please put your name: ') 2 print (' Hi {} '. Format (name)) 3 print (' Mr. {} hobbit is eating, sleeping, hitting peas '. Format (Name[0])) 4 Print (' Dear {} should go to work! '. Format (name[1]))`

3. The user enters two numbers and calculates and outputs the sum of two digits:

`Print (' Sub is:{} '. Format (float (input (' first number: ')) +float (input (' second number: ')))`

4. User input triangle three-side length, and calculate the area of the triangle: (Helen Formula)

`1 a=input (' Please enter first edge: ') 2 b=input (' Please enter second edge: ') 3 c=input ("Please enter third side:") 4 c= (float (a) +float (b) +float (c)) 5 s= (c/2* (float (C/2) -float (a)) * (Float (C/2)-float (b)) * (Float (C/2)-float (C))) **0.56 print (' The area of the triangle is {} '. Format (S))`

5. Enter a radius to calculate the area of the circle.

`R=input (' Please input r: ') Area=3.1415*float (R) *float (r) print ("{:. 2f}". Format (area))`

6. Draw a set of identical tangent circles

`1 Import turtle2 turtle.pensize (Ten) 3 turtle.circle (4) turtle.circle (+) 5 turtle.circle (+) 6 turtle.circle (120)`

7. Draw a Pentagram

`1 Import turtle as T 2 t.speed (1) 3 for I in range (5): 4     T.forward (+) 5     t.right (144)`

8. Draw a All-yellow pentagram

`1 Import Turtle 2 turtle.color (' Yellow ') 3 turtle.fillcolor (' Yellow ') 4 turtle.speed (1) 5 turtle.pensize (Ten) 6 Turtle.begi N_fill () 7 for I in range (5): 8     Turtle.forward () 9     turtle.right (144) Turtle.end_fill ()`

Additional question 1: Draw a set of concentric circles:

`1 Import Turtle 2 Turtle.penup () 3 Turtle.goto (0,-100) 4 Turtle.pendown () 5 turtle.circle (+) 6 turtle.penup () 7 turtle.g Oto (0,-80) 8 Turtle.pendown () 9 turtle.circle (\$) turtle.penup () Turtle.goto (0,-60) Turtle.pendown () 13 Turtle.circle () Turtle.penup () Turtle.goto (0,-40) Turtle.pendown () turtle.circle (40)`

Draw five pentagram on the national flag

`Import TurtleDef draw_square ():Turtle.color (' Red ')Turtle.fillcolor (' Red ')# turtle.speed (1)Turtle.penup ()Turtle.goto (-200,200)Turtle.pendown ()Turtle.begin_fill ()Turtle.forward (400)Turtle.right (90)Turtle.forward (200)Turtle.right (90)Turtle.forward (400)Turtle.right (90)Turtle.forward (200)Turtle.right (90)Turtle.end_fill ()# Time.sleep (5)Def Draw_big_star ():Turtle.color (' Yellow ')Turtle.fillcolor (' Yellow ')# turtle.speed (1)Turtle.penup ()Turtle.goto (-175,155)Turtle.pendown ()Turtle.begin_fill ()For I in range (5):Turtle.forward (50)Turtle.right (144)Turtle.end_fill ()def draw_smallstar (x, Y, z):Turtle.color (' Yellow ')Turtle.fillcolor (' Yellow ')# turtle.speed (1)Turtle.penup ()Turtle.goto (x, y)Turtle.pendown ()Turtle.begin_fill ()Turtle.right (z)For I in range (5):Turtle.forward (15)Turtle.right (144)Turtle.end_fill ()Draw_square ()Draw_big_star ()Draw_smallstar ( -110,175,5)Draw_smallstar ( -90,155,15)Draw_smallstar ( -95,125,25)Draw_smallstar ( -110,105,0)`

Python input and output exercises, arithmetic exercises, turtle preliminary exercises

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