Python输入输出练习，运算练习，turtle初步练习

print("hello word")

n1=input("1")
n2=input("2:")
print(float(n1)+float(n2))

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: ‘))

# 计算半周长
s = (a + b + c) / 2
print(‘三角形半周长为 %0.2f‘ %s)
# 计算面积 用海伦公式S＝√[p(p-a)(p-b)(p-c)]{a,b,c为边长，P为半周长＝（a＋b＋c）/2}
area = (s*(s-a)*(s-b)*(s-c)) ** 0.5
print(‘三角形面积为 %0.2f‘ %area)

pi=3.14
r = float(input(‘输入元圆的半径: ‘))
# 计算圆的面积
area = pi*r*r
print(‘圆面积为 %0.2f‘ %area)

import turtle

turtle.circle(10)
turtle.circle(30)
turtle.circle(60)
turtle.circle(100)

import turtle

turtle.hideturtle()
turtle.speed(10)

turtle.begin_fill()
for i in range(5):
    
    turtle.forward(300)
    turtle.left(144)

turtle.end_fill()

import turtle

turtle.hideturtle()
turtle.speed(10)
turtle.color("green")
turtle.fillcolor("green")
turtle.begin_fill()
for i in range(5):
    
    turtle.forward(300)
    turtle.left(144)

turtle.end_fill()