1 # 转换
 2 # 字符串转换列表 li = list("asdfasdfasdf"), 内部使用for循环
 3 s = "pouaskdfauspdfiajsdkfj"
 4 new_li = list(s)
 5 print(new_li)
 6 
 7 # 列表转换成字符串，
 8 # 需要自己写for循环一个一个处理： 既有数字又有字符串2018-07-23
 9 li = [11,22,33,"123","alex"]
10 r = str(li) ‘[11,22,33,"123","alex"]‘
11 print(r)
12 s = ""
13 for i in li:
14 s = s + str(i)
15 print(s)
16 # 直接使用字符串join方法：列表中的元素只有字符串
17 li = ["123","alex"]
18 v = "".join(li)
19 print(v)
20 
21  

1  li.append(5)
2  li.append("alex")
3  li.append([1234,2323])
4  print(li)

1 li.clear() 
2 print(li)

1  v = li.copy()
2  print(v)

1  v = li.count(22)
2  print(v)

 1  li = [11, 22, 33, 22, 44]
 2  li.append([9898,"不得了"])
 3  [11, 22, 33, 22, 44, [9898, ‘不得了‘]]
 4 
 5  li.extend([9898,"不得了"])
 6 
 7  for i in [9898,"不得了"]:
 8  li.append(i)
 9  [11, 22, 33, 22, 44, 9898, ‘不得了‘]
10 
11  li.extend("不得了")
12  print(li)

1  li = [11, 22, 33, 22, 44]
2  v= li.index(22)
3  print(v)

1  li = [11, 22, 33, 22, 44]
2  li.insert(0,99)
3  print(li)

1  li = [11, 22, 33, 22, 44]
2  v = li.pop()
3  print(li)
4  print(v)
5 
6  li = [11, 22, 33, 22, 44]
7  v = li.pop(1)
8  print(li)
9  print(v)

1  li = [11, 22, 33, 22, 44]
2  li.remove(22)
3  print(li)

1  li = [11, 22, 33, 22, 44]
2  li.reverse()
3  print(li)

1  li = [11,44, 22, 33, 22]
2  li.sort()
3  li.sort(reverse=True)
4  print(li)
5 
6