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

Source: Internet
Author: User
Tags arithmetic goto

1. Hello world!
1. Print ("Hello world!! ")
2. Simple Interactive (interactive, file-style) textbook P19
1. Name=input ("What is your name?\n") where=input ("where is you now?\n") Age=input ("How is old is you ? \ n")Print("your name is {}". Format (name))Print("You live in {}". Format (where)Print("You is {} years old". Format (age))
3. The user enters two numbers and calculates and outputs the sum of two digits:
1. Num1=input ("input a number:\n") num2=input ("input an other number:\ n")print(sum,end=" ") sum=num1+num2
4. The user enters the triangular three-side length and calculates the area of the triangle: (Helen Formula)
5.  a = float (input ( "  Enter first edge length:   " )) b  = float (Input (  "  Enter the second side edge length:   "  = float (input ( "  Enter the third edge length:   " )) s  = (A + B + c)/2area  = (s* (s-a) * (s-b) * (S-C) * * * 0.5print  ( "   "%area)
6. Enter a radius to calculate the area of the circle.
pi=3.1415926R=float (input (" Please enter radius:"))area =pi*r*RPrint (" area of%0.2f"%area)
7. Draw a set of identical tangent circles
Import turtleturtle.speed (turtle.circle)turtle.circle(()turtle.circle ( ) turtle.circle (40)
8. draw a pentagram
import   Turtleturtle.speed (  100) Turtle.forward ( 100 144) Turtle.forward ( 100 144) Turtle.forward ( 100 144) Turtle.forward ( 100 144) Turtle.forward ( 100 144)
9. Draw an all-yellow pentagram
Import turtleturtle.speed (turtle.fillcolor) ("yellow") Turtle.begin _fill (Turtle.forward)turtle.right(144) Turtle.forward (+) turtle.right(144 ) Turtle.forward (turtle.right) (144) Turtle.forward(+)turtle.right ( 144) Turtle.forward (+) turtle.right (144) Turtle.end_fill ()

Thinking:

1. Draw a set of concentric circles.
ImportTurtle#Draw First CircleTurtle.penup () turtle.goto (0,-200) Turtle.pendown () turtle.circle (200)#Draw Second CircleTurtle.penup () turtle.goto (0,-150) Turtle.pendown () turtle.circle (150)#Draw Third CircleTurtle.penup () turtle.goto (0,-100) Turtle.pendown () turtle.circle (100)#Draw Fourth CircleTurtle.penup () turtle.goto (0,-50) Turtle.pendown () turtle.circle (50)
2. Draw five pentagram on the national flag

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

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