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

Topic:

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

1: Output Hello world!

Print ('helloworld') 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:]))

Effect:

Interactive:

 while a <:    Print(A, end=',')    = B, A + B0,1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, 233, 377, 610, 987,

3: Add two numbers

>>> NUM1 = input (' Please enter first number:') Enter the first number:11>>> num2 = input ('  Please enter a second number:') Enter the second number:12>>> sum = Int (NUM1) +int (num2)Print ("sum=%d"%(sum)) sum

One line of code implementation:

Print (' two and%.2f'% (float (input (' Enter first number:') ') +float (input ('  Please enter the second number:'))) Enter the first number: Please enter the second number:two sum of each .

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

A = float (input (' enter ' The first edge of the triangle:'= float (input (' Please enter the second side of the triangle length:  '= float (input (' Enter ' triangle third side length:'= (a+b+c)/2= (p* (p-a * (p-b) * (P-C)) * * * 0.5print(' triangular area bit%0.2f' %area)

Results:

5: Enter the radius to calculate the area of the circle

Import= float (input (' Enter radius of circle:'= math.pi* (r**2)  Print(' round area%0.2f'%area)

Effect:

6: Draw a same tangent circle

Import Turtle>>> turtle.circle (+)>>> turtle.circle (+)>>> Turtle.circle (+)

Effect:

7 Draw a Pentagram

Import Turtle>>> turtle.forward (+)>>> turtle.right (144)>>> Turtle.forward >>> turtle.right(144)>>> turtle.forward (+)> >> turtle.right (144)>>> turtle.forward (+)>>> turtle.right (144) >>> Turtle.forward (+)

Effect:

8: Draw a color-filled pentagram

>>>ImportTurtle>>> Turtle.fillcolor ("Yellow")>>> Turtle.pencolor ("Yellow")>>>Turtle.begin_fill ()>>> Turtle.forward (100)>>> Turtle.right (144)>>> Turtle.forward (100)>>> Turtle.right (144)>>> Turtle.forward (100)>>> Turtle.right (144)>>> Turtle.forward (100)>>> Turtle.right (144)>>> Turtle.forward (100)>>>Turtle.end_fill ()>>>

Effect:

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