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

1. Hello world!

   Print ("hello,world!")

   　　

2. Simple Interactive (interactive, file-style) textbook P19

   Name=input (" Please enter name:")print("{} students, please study!")  ". Format (name))

3. The user enters two numbers and calculates and outputs the sum of two digits:

   N1=input ("1:") N2=input ("2:") print (float (N1) +float (n2))

   　　

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

A=input ("A:") b=input ("B:") C=input (  "C:") s= (float (a) +float (b) +float (c))/2L=float (s) * (float (s)-float (a)) * (float (s)-float (b)) * (float (s)-float (c))area =float (l) **0.5print(area)

5. Enter a radius to calculate the area of the circle.

R=input ("r:")area =3.14*float (R) *float (r)print(area)

6. Draw a set of identical tangent circles

Import turtleturtle.circle (turtle.circle) turtle.circle (100)

　　

7. Draw a Pentagram

Import Turtleturtle.shape ("turtle")  for  in range (5):    turtle.forward (+)    turtle.left (144)    Turtle.forward (+) Turtle.end_fill ()

8. Draw a All-yellow pentagram

 import   Turtleturtle.color (  " blue  "  Span style= "COLOR: #000000" >) Turtle.fillcolor (  " red   " ) Turtle.begin_fill () turtle.speed ( 10) Turtle.shape (  " turtle   " )  for  i in  range (5 100" Turtle.left ( 144) Turtle.forward ( 100) Turtle.end_fill ()  

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