1.列表和字符串操作的混合练习
1 ten_things = "apples oranges crows telephone light sugar" 2 3 print("Wait there are not 10 things in that list. Let's fix it.") 4 5 stuff = ten_things.split() 6 more_stuff = ["day","night","song","frisbee","corn","banana","girl","boy"] 7 8 while len(stuff) != 10: 9 next_one = more_stuff.pop()10 print("Adding:",next_one)11 stuff.append(next_one)12 print(f"There are {len(stuff)} items now.")13 14 print("There we go:",stuff)15 16 print("Let's do some things with stuff")17 18 print(stuff[1])19 print(stuff[-1])20 print(stuff.pop())21 print(' '.join(stuff))22 print('#'.join(stuff[3:5])) 输出
Wait there are not 10 things in that list. Let's fix it.Adding: boyThere are 7 items now.Adding: girlThere are 8 items now.Adding: bananaThere are 9 items now.Adding: cornThere are 10 items now.There we go: ['apples', 'oranges', 'crows', 'telephone', 'light', 'sugar', 'boy', 'girl', 'banana', 'corn']Let's do some things with stufforangescorncornapples oranges crows telephone light sugar boy girl bananatelephone#light
2. 列表的索引和操作
参考：
python在设计索引下标的时候都是采用左闭右开区间的形式，是个值得注意的小细节。
1 list = ['a','b','c','d']2 x1 = list[0] # x1 = a3 x2 = list[-1] # x2 = d 此时 list = ['a','b','c','d']4 x3 = list.pop() # x3 = d 此时 list = ['a','b','c']5 x4 = list[1:2] # x4 = b 注意python中索引时[]为左闭右开区间
list.pop()表示取出列表最后一个元素返回给当前被赋值的变量。
3. str.join(sequence)
返回被str连接的sequence序列，如
1 str = "-"2 sequence = ["a","b","c"]3 print(str.join(sequence))
输出为
a-b-c
一般sequence是一个列表，如果它是一个字符串，则将字符串中每个字符视为一个元素并用str去连接它们，如
1 str = "-"2 sequence = "test"3 print(str.join(sequence))
输出为
t-e-s-t
4.进一步理解python的列表（作为一种常见的数据结构）
有序；
可随机访问，也可线性访问（使用索引）；
查找时需要依次检索
5.巩固练习-概念理解
面向对象编程，object oriented programming（OOP）
python中的类（class）
函数式编程，functional programming