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

Source: Internet
Author: User

First, the output Hello World

`Print ("Hello Word")`

Second, summation operation

`A1 = input ("A1:"= input ("A2:"= float (A1) + float (A2) Print (" the first number {0} plus the second number {1} and is {2}". Format (a1,a2,sum))`

Three sides of the input triangle to seek the area

`Import= input ("A1:"= input ("A2:"  = input ("A3:"= (float (A1) +float (A2) +float (A3))/2D == d* (d-float (A1)) * (D-float (A2)) * (D-float (A3)) b=float (area) c=  Math.sqrt (b)print(c)`

Four, the radius of the input circle, to calculate the area

`Circle = input (" Circle Radius:"= 3.14 * FLOAT (circle) *float (circle)Print (area)`

Five, no color of the pentagram

`Import= 0 while a < 5:    turtle.forward (\$)    Turtle.left (144)    = a + 1`

Six, painted yellow pentagram

From Turtle Import *
FillColor ("Yellow")
Begin_fill ()
While True:
Forward (200)
Left (144)

If ABS (POS ()) <1:
Break
End_fill ()

Seven, draw the same cut round

`Import turtleturtle.pensize (8) turtle.circle (ten) turtle.circle(turtle.circle) (40 ) turtle.circle (turtle.circle) (160)`

Eight, simple interaction

`Name = input (" Enter name:")print("{} classmate, learn Python, promising!")  ". Format (name))`

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

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