Python

print(‘Hello World!‘)

num1 = input(‘输入第一个数字：‘)
num2 = input(‘输入第二个数字：‘)
sum = float(num1) + float(num2)
print(‘数字 {0} 和 {1} 相加结果为： {2}‘.format(num1, num2, sum))

a = float(input(‘输入三角形第一边长: ‘))
b = float(input(‘输入三角形第二边长: ‘))
c = float(input(‘输入三角形第三边长: ‘))

s = (a + b + c) / 2

area = (s*(s-a)*(s-b)*(s-c)) ** 0.5
print(‘三角形面积为 %0.2f‘ %area)

a=input("please input 半径:")
b=3.14
area=float(a)*float(a)*float(b)
print(area)

import turtle
turtle.circle(20)
turtle.circle(50)
turtle.circle(100)

import turtle
turtle.begin_fill()
for i in range(5):
    turtle.forward(100)
    turtle.left(144)

import turtle
turtle.color("yellow")
turtle.fillcolor("yellow")
turtle.begin_fill()
for i in range(5):
    turtle.forward(100)
    turtle.left(144)
turtle.end_fill()