python语言程序设计基础(第二版)第一章课后习题

import turtle
# 1
str1 = input("请输入一个人的名字：")
str2 = input("请输入一个国家名字：")
print("世界这么大，{}想去{}看看".format(str1, str2))

# 2
n = input("请输入整数N：")
sum = 0
for i in range(int(n)):
    sum += i
print("1到N求和结果：", sum)

# 3
for i in range(1, 10):
    for j in range(1, i+1):
        print("{}*{}={:2}".format(j, i, i*j))
    print(' ')

# 4
sum, tmp = 0, 1
for i in range(1, 11):
    tmp *= i
    sum +=tmp
print("运算结果是：{}".format(sum))

# 5
n = 1
for i in range(4, 0, -1):
    n = (n+1) << 1
print(n)

# 6
diet = ['西红柿', '花椰菜', '黄瓜', '牛排', '虾仁']
for x in range(0, 5):
    for y in range(0, 5):
        if not(x == y):
            print("{}{}".format(diet[x], diet[y]))

# 7
turtle.fillcolor("red")
turtle.begin_fill()
while True:
    turtle.forward(200)
    turtle.right(144)
    if abs(turtle.pos()) < 1:
        break
turtle.end_fill()

# 8
turtle.color('red', 'yellow')
turtle.begin_fill()
while True:
    turtle.forward(200)
    turtle.left(170)
    if abs(turtle.pos()) < 1:
        break
turtle.end_fill()
turtle.done()