Python第四章课后作业

4-1比萨：

pizzas=['apple_pizza','banana_pizza','beef_pizza']
for pizza in pizzas:
	print('I like '+pizza)
print('I really like pizza')

运行结果：

4-2动物：

animals=['dog','cat','tortoise']
for animal in animals:
	print('A '+animal+' would make a great pet')
print('Any of these animals would make a great pet')

运行结果：

4-3数到20：

for num in range(1,21):
	print(num,end=' ')
print('\n')

运行结果：

4-4一百万：

arr=list(range(1,1000001))
for num in arr:
	print(num,end=' ')

运行结果（结果太长就截一部分）：

4-5计算1~1000000的总和：

arr=list(range(1,1000001))
print(min(arr))
print(max(arr))
print(sum(arr))

运行结果：

4-6奇数：

arr=list(range(1,20,2))
for x in arr:
	print(x,end=' ')

运行结果：

4-7 3的倍数：

arr=[3*i for i in range(1,11)]
for num in arr:
	print(num,end=' ')

运行结果：

4-8立方：

arr=[i**3 for i in range(1,11)]
for num in arr:
	print(num,end=' ')

运行结果：

4-9立方解析：

同上

4-10切片：

arr=['one','two','three','four','five']
print('The first three items in the list are:')
for num in arr[:3]:
	print(num,end=' ')
print('Three items from the middle of the list are:')
for num in arr[1:4]:
	print(num,end=' ')
	print('The last three items in the list are:')
for num in arr[-3:]:
	print(num,end=' ')

运行结果：

4-11你的比萨和我的比萨：

pizzas=['apple_pizza','banana_pizza','beef_pizza']
friend_pizzas=pizzas[:]
pizzas.append('chicken_pizza')
friend_pizzas.append('big_pizza')
print("My favourite pizzas are:")
for pizza in pizzas:
	print(pizza,end=' ')
print("\nMy friend's favourite pizzas are:")
for pizza in friend_pizzas:
	print(pizza,end=' ')	

运行结果：

4-12 使用多个循环：

同上

4-13自助餐：

foods=('beef','chicken','hanburger','apple','vegetables')
for food in foods:
	print(food,end=' ')	

运行结果：

尝试修改：

foods[1]='milk'

结果：

替换:

print('\n')
foods=('banana','duck','hanburger','apple','vegetables')
for food in foods:
	print(food,end=' ')	

运行结果：

4-14：浏览https://python.org/dev/peps/pep-0008/

4-15 已经设置好自己的编辑器