明天的内容对于列表及相干操作
拜访列表元素
bicycles = ['trek','cannondale','redline','specialized']print(bicycles[0])print(bicycles[0].title())print(bicycles[-1]) # 返回最初一个元素message = "My first bicycle was a " + bicycles[0].title() + "."print(message)输入后果为：
trek
Trek
specialized
My first bicycle was a Trek.
批改列表元素
motorcycles = ['honda','yamaha','suzuki']print(motorcycles)motorcycles[0] = 'ducati'print(motorcycles)输入后果为：
['honda', 'yamaha', 'suzuki']
['ducati', 'yamaha', 'suzuki']
# 在列表开端增加元素motorcycles.append('honda')print(motorcycles)# 在列表中插入元素motorcycles.insert(0,'another')print(motorcycles)# 在列表中删除元素del motorcycles[0]print(motorcycles)输入后果为：
['ducati', 'yamaha', 'suzuki', 'honda']
['another', 'ducati', 'yamaha', 'suzuki', 'honda']
['ducati', 'yamaha', 'suzuki', 'honda']
# 应用办法pop()删除并存储元素popped_motorcycles = motorcycles.pop() # 将被弹出的值存储起来，默认为末位元素print(popped_motorcycles)print(motorcycles)输入后果为：
honda
['ducati', 'yamaha', 'suzuki']
# 应用办法remove()指定删除某个具体元素motorcycles.remove('yamaha')print(motorcycles)# 只能删除第一个呈现的元素，不能删除所有反复的输入后果为：
['ducati', 'suzuki']
# 应用sort()对列表进行永久性排序cars = ['bwm','audi','toyota','subaru']print(cars)cars.sort() # 默认为字母正排序print(cars)cars.sort(reverse = True) # 逆排序print(cars)# 应用sorted()对列表进行长期排序print(sorted(cars))print(cars)# 单纯反转列表元素print(cars)cars.reverse()print(cars)输入后果为：
['bwm', 'audi', 'toyota', 'subaru']
['audi', 'bwm', 'subaru', 'toyota']
['toyota', 'subaru', 'bwm', 'audi']
['audi', 'bwm', 'subaru', 'toyota']
['toyota', 'subaru', 'bwm', 'audi']
['toyota', 'subaru', 'bwm', 'audi']
['audi', 'bwm', 'subaru', 'toyota']
# 确定列表元素个数print(len(cars))输入后果为：
4
# 遍历整个列表magicians = ['alice', 'david', 'caroline']for magician in magicians: print(magician.title() + ', that was a great trick !')输入后果为：
Alice, that was a great trick !
David, that was a great trick !
Caroline, that was a great trick !
# 创立数字列表for value in range(1, 5): # range()让python从指定的第一个值开始数，并在达到你指定的第二个值后进行，因而不蕴含第二个值 print(value)numbers = list(range(1, 5)) # 将系列数字转换为列表print(numbers)even_numbers = list(range(2, 11, 2)) # 指定步长为2，打印偶数print(even_numbers)输入后果为：
1
2
3
4
[1, 2, 3, 4]
[2, 4, 6, 8, 10]
# 创立平方数squares = []for value in range(1, 11): square = value**2 squares.append(square)print(squares)输入后果为：
[1, 4, 9, 16, 25, 36, 49, 64, 81, 100]
# 简略的统计计算print(min(squares))print(max(squares))print(sum(squares))输入后果为：
1
100
385
# 简要写法squares = [value**2 for value in range(1,11)]print(squares)输入后果为：
[1, 4, 9, 16, 25, 36, 49, 64, 81, 100]
# 应用列表的一部分（切片）print(squares[0:3])print(squares[:4]) # 未指定结尾，则从第一个开始print(squares[-3:]) # 开端的三个元素输入后果为：
[1, 4, 9]
[1, 4, 9, 16]
[64, 81, 100]
# 复制列表another_squares = squares[:]print(another_squares)输入后果为：
[1, 4, 9, 16, 25, 36, 49, 64, 81, 100]
# 不可变的列表——元组dimensions = (200,50)print(dimensions[0])print(dimensions[1])for dimension in dimensions: print(dimension)输入后果为：
200
50
200
50
dimensions = (400,100) # 不能批改繁多元素，但能从新定义整体print(dimensions)输入后果为：
(400, 100)