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

2. Hello world!

   1. Print ("Hello world!! ")

3. 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))

5. 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

7. The user enters the triangular three-side length and calculates the area of the triangle: (Helen Formula)

9.  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) 

11. 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)

13. Draw a set of identical tangent circles

    Import turtleturtle.speed (turtle.circle)turtle.circle(()turtle.circle ( ) turtle.circle (40)

15. 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) 

17. 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)

3. Draw five pentagram on the national flag

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