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

Source: Internet
Author: User

• Hello world!
• Simple Interactive (interactive, file-style) textbook P19
• `radius=25Area =3.1415*radius*radiusprint('  {:. 2f} '. Format (area)`

• The user enters two numbers and calculates and outputs the sum of two digits:
• `A=input (' Please enter the first number:') b=input (" Please enter the second number:") C =float (a) +float (b)print(' two of sum:')Print (c)`
• The user enters the triangular three-side length and calculates the area of the triangle: (Helen Formula)
• ` while1==1: A=float (Input ('Please enter the first edge of the triangle: \ n')) b=float (Input ('Please enter the second edge of the triangle: \ n')) C=float (Input ('Please enter the third side of the triangle: \ n'))    if(A+B&GT;C) and(A+C&GT;B) and(B+c>a) andABS ((a) <c) andABS ((A-C) <b) andABS ((B-C) <a): Break        Else:        Print('input wrong, please re-enter! \ n') P=float ((a+b+c)/2) s=float (p* (p-a) * (p-b) * (p-c)) **0.5Print('area of%.2f'%S`

• Enter a radius to calculate the area of the circle.
• `# r=float (Input (' Please enter radius of circle: ')) Print (' area:', 3.1415*float (Input (' Please enter radius of circle:') ') **2)`

• Draw a set of identical tangent circles
• `Import turtleturtle.circle (turtle.circle)turtle.circle(+)turtle.circle ( 100)`

• Draw a Pentagram
• `Import Turtle  for  in range (5):    turtle.forward (+)    Turtle.left (144)`
• Draw an all-yellow pentagram
• `Import turtleturtle.shape ('turtle') turtle.speed()Turtle.color ( ' yellow') turtle.fillcolor ('yellow' ) ) Turtle.begin_fill () for in range (5):    turtle.forward (+)    Turtle.left (144) Turtle.end_fill ()`

• Thinking
• Draw a set of concentric circles.
• `Import turtleturtle.speed (turtle.penup) turtle.goto (0,+) Turtle.pendown () turtle.circle ( Turtle.penup () turtle.goto (0)turtle.pendown () turtle.circle ()turtle.penup () Turtle.goto (0,turtle.pendown) turtle.circle ()turtle.penup () turtle.goto (0,+) Turtle.pendown () turtle.circle (70)`

• Draw five pentagram on the national flag.
`ImportTurtleturtle.speed (41) Turtle.penup () Turtle.goto (-300,240) Turtle.pendown ()##画国旗背景Turtle.fillcolor ('Red') Turtle.begin_fill () Turtle.forward (600) Turtle.right (90) Turtle.forward (400) Turtle.right (90) Turtle.forward (600) Turtle.right (90) Turtle.forward (400) Turtle.end_fill ()##画大五角星Turtle.penup () Turtle.goto (-263,163) Turtle.pendown () Turtle.color ('Yellow') Turtle.fillcolor ('Yellow') Turtle.begin_fill () Turtle.right (90) forIinchRange (5): Turtle.forward (100) Turtle.right (144) Turtle.end_fill ()##画小五角星##第一个Turtle.penup () Turtle.goto (-126,211) Turtle.pendown () Turtle.color ('Yellow') Turtle.fillcolor ('Yellow') Turtle.begin_fill () Turtle.right (90) forIinchRange (5): Turtle.forward (20) Turtle.right (144) Turtle.end_fill ()##第二个Turtle.penup () Turtle.goto (-100,160) Turtle.pendown () Turtle.color ('Yellow') Turtle.fillcolor ('Yellow') Turtle.begin_fill () Turtle.right (90) forIinchRange (5): Turtle.forward (20) Turtle.right (144) Turtle.end_fill ()##第三个Turtle.penup () Turtle.goto (-107,116) Turtle.pendown () Turtle.color ('Yellow') Turtle.fillcolor ('Yellow') Turtle.begin_fill () Turtle.right (90) forIinchRange (5): Turtle.forward (20) Turtle.right (144) Turtle.end_fill ()##第四个Turtle.penup () Turtle.goto (-133,95) Turtle.pendown () Turtle.color ('Yellow') Turtle.fillcolor ('Yellow') Turtle.begin_fill () Turtle.right (90) forIinchRange (5): Turtle.forward (20) Turtle.right (144) Turtle.end_fill ()`

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

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