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

Source: Internet
Author: User

Topic:

Hello world!
Simple Interactive (interactive, file-style) textbook P19
The user enters two numbers, calculates and outputs the sum of two digits (try to implement it in one line of code).
The user enters the triangular three-side length and calculates the area of the triangle: (Helen Formula)
Enter a radius to calculate the area of the circle.
Draw a set of identical tangent circles
Draw a Pentagram
Draw an all-yellow pentagram

1. Hello world!

`Print ('Hello world! ' ) Hello world!`

2. Simple interaction

`Name = input (" Enter name:")print("{} Students, learn python, promising!")  . Format (name)print("{} heroes, learn Python, promising!")  . Format (name[0))print("{} brother, learn Python, promising!")  ". Format (name[1:]))`

Results:

3. Simple calculation

`N1 = input (' Enter the first number:'= input (' Please enter a second number:'  ) = Int (n1) +int (n2)print("sum=%d"% (sum))`

Results:

Use one line of code:

`Print (' two number of%.2f'% (float (input (' Enter first number:') ') +float (input ( ' Please enter a second number: ')))`

Results:

4, calculate the area of the triangle

`L1 = float (input (' Enter the length of the first edge:'= float (input (' Enter the length of the second edge: '  = float (input (' Enter the length of the third side:'= (L1+L2+L3)/2= (p* (P-L1) * (P-L2) * (P-L3)) **0.5print(' Triangle area:%.2f'%s)`

Results:

5, calculate the area of the circle

`R = Float (input (' Enter the radius of the circle:'= r**2*3.14print( The area of the circle is:%.2f  '%s ')`

Results:

6, draw a group of same cut round

`Import turtleturtle.circle (turtle.circle)turtle.circle(())turtle.circle ( 200)`

Results:

7. Draw a Pentagram

`Import Turtleturtle.forward (turtle.right) (144) Turtle.forward(turtle.right) ( 144) Turtle.forward (\$) turtle.right (144) Turtle.forward(+) turtle.right ( 144) Turtle.forward (200)`

Results:

8. Draw a All-yellow pentagram

`Import Turtleturtle.color ('yellow') turtle.fillcolor ('Yellow  ') Turtle.begin_fill (Turtle.forward)turtle.right(144) Turtle.forward (turtle.right) turtle.forward (144)turtle.right (144) Turtle.forward (turtle.right) (144) Turtle.forward() Turtle.end_fill () `

Results:

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

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