Python练习

1、Hello World

print('hello world')

2、简单交换

name = input("输入姓名：")
print("{}同学,学好python，前途无量！".format(name))
print("{}大侠，学好python，前途无量！".format(name[0]))
print("{}哥哥，学好python，前途无量！".format(name[1:]))

3、输入两个数，计算两数之和（一行代码）

print('结果:%.0f'%float(float(input('输入第一个数字:'))+float(input('输入第二个数字:'))))

4、输入三角形三边长度，计算三角形面积（海伦公式）

l1 = float(input('请输入第一条边的长度：'))
l2 = float(input('请输入第二条边的长度：'))
l3 = float(input('请输入第三条边的长度：'))
p = (l1+l2+l3) / 2
s = (p*(p-l1)*(p-l2)*(p-l3))**0.5
print('三角形的面积为:%.2f'%s)

5、输入半径，计算圆的面积

radius = float(input("半径："))
area = float(3.1415 * radius * radius)
print("面积：%.2f"%area)

6、画一组同切圆

import turtle
turtle.circle(10)
turtle.circle(20)
turtle.circle(30)
turtle.circle(40)
turtle.circle(50)

7、画一个五角星

import turtle
turtle.forward(200)
turtle.right(144)
turtle.forward(200)
turtle.right(144)
turtle.forward(200)
turtle.right(144)
turtle.forward(200)
turtle.right(144)
turtle.forward(200)

8、画一个全黄色五角星

import turtle
turtle.color('yellow')
turtle.fillcolor('yellow')
turtle.begin_fill()
turtle.forward(200)
turtle.right(144)
turtle.forward(200)
turtle.right(144)
turtle.forward(200)
turtle.right(144)
turtle.forward(200)
turtle.right(144)
turtle.forward(200)
turtle.end_fill()

9、画一组同心圆

import turtle
turtle.penup()
turtle.goto(0,-200)
turtle.pendown()
turtle.circle(200)
turtle.penup()
turtle.goto(0,-150)
turtle.pendown()
turtle.circle(150)
turtle.penup()
turtle.goto(0,-100)
turtle.pendown()
turtle.circle(100)

10、画国旗

import turtle
turtle.color('yellow')
turtle.bgcolor('red')
turtle.fillcolor('yellow')

turtle.begin_fill()

turtle.up()
turtle.goto(-200,100)
turtle.down()

turtle.forward(150)
turtle.right(144)
turtle.forward(150)
turtle.right(144)
turtle.forward(150)
turtle.right(144)
turtle.forward(150)
turtle.right(144)
turtle.forward(150)
turtle.end_fill()

turtle.begin_fill()

turtle.up()
turtle.goto(-80,160)
turtle.down()

turtle.forward(50)
turtle.right(144)
turtle.forward(50)
turtle.right(144)
turtle.forward(50)
turtle.right(144)
turtle.forward(50)
turtle.right(144)
turtle.forward(50)
turtle.end_fill()

turtle.begin_fill()

turtle.up()
turtle.goto(-22,68)
turtle.down()

turtle.forward(50)
turtle.right(144)
turtle.forward(50)
turtle.right(144)
turtle.forward(50)
turtle.right(144)
turtle.forward(50)
turtle.right(144)
turtle.forward(50)
turtle.end_fill()

turtle.begin_fill()

turtle.up()
turtle.goto(-30,110)
turtle.down()

turtle.forward(50)
turtle.right(144)
turtle.forward(50)
turtle.right(144)
turtle.forward(50)
turtle.right(144)
turtle.forward(50)
turtle.right(144)
turtle.forward(50)
turtle.end_fill()

turtle.begin_fill()

turtle.up()
turtle.goto(-45,-10)
turtle.down()

turtle.forward(50)
turtle.right(144)
turtle.forward(50)
turtle.right(144)
turtle.forward(50)
turtle.right(144)
turtle.forward(50)
turtle.right(144)
turtle.forward(50)
turtle.end_fill()