二、python——列表

bicycles = ["trek", "cannondale", "redline"]
print(bicycles[0])
print(bicycles[0].title())
# 索引为-1,返回最后一个元素
print(bicycles[-1])
print(bicycles[-1].title())

motorcycles = ["honda", "yamaha", "suzuki"]
print(motorcycles)
# 修改第一个元素
motorcycles[0] = 'ducati'
print(motorcycles)
# 追加元素
motorcycles.append("honda")
print(motorcycles)
# 在指定位置插入元素
motorcycles.insert(0, "insert")
print(motorcycles)
# 删除指定位置元素
del motorcycles[0]
print(motorcycles)
# 删除最后一个元素
popped_motorcycle = motorcycles.pop()
print(motorcycles)
print(popped_motorcycle)
# 删除第一个ducati元素
motorcycles.remove("ducati")
print(motorcycles)

# sort永久排序 list.sort()
cars = ["bmw", "audi", "toyouta", "subaru"]
cars.sort()
print(cars)
# 排序相反顺序 reverse=True
cars.sort(reverse=True)
print(cars)

# sorted临时排序 sorted(list)
cars = ["bmw", "audi", "toyouta", "subaru"]
print(sorted(cars))
print(cars)
# 逆序 永久修改
cars.reverse()
print(cars)
# 列表长度
print(len(cars))

# 遍历列表
magicians = ["alick", "david", "caroline"]
for magician in magicians:
    print(magician.title() + 'is a mangician.')
    print("i can't wait to see your next trick," + magician.title() + '\n')
print("thank you".title())

for val in range(1, 5):
    print(val)

number = list(range(1, 5))
print(number)
# 步进2
even_number = list(range(2, 11, 2))
print(even_number)

# **表示乘方运算，输出1~10的平方
squares = []
for value in range(1, 11):
    square = value**2
    squares.append(square)
print(squares)

digits = [1, 2, 3, 4, 5, 6, 7, 8, 9, 0]
print(min(digits))
print(max(digits))
print(sum(digits))

# 列表解析,以下示例中，表达式为value**2，它计算平方值，接下来编写一个for循环，用于给表达式提供值，再加上方括号。
squares = [value**2 for value in range(1, 11)]
print(squares)

squares = [value**3 for value in range(1, 11)]
print(squares)

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

# 切片 list[m:n]
players = ['aa', 'bb', 'cc', 'dd', 'ee', 'ff', 'gg']
print(players[0:3])
print(players[1:4])
# 从列表开头开始
print(players[:3])
# 切片终止于列表末尾
print(players[4:])
# 负数索引返回离列表末尾相应距离的元素
print(players[-3:])
for player in players[:3]:
    print(player.title())

# 复制列表 list[:]
my_food = ['pizza', 'falafel', 'cake']
friend_food = my_food[:]
my_food.append('ice cream')
friend_food.append('cannoli')
print('my foods are:')
for value in my_food:
    print(value)
print('friend foods are:')
for value in friend_food:
    print(value)

# 元组：不可变的列表，用圆括号标识，不可修改元组的元素，但可以为元组直接赋值
dimensions = (200, 50)
print(dimensions[0])
print(dimensions[1])