Python Basics-Lists (list)

1. List definition

list=[‘张三‘,‘李四‘,123]

2. Accessing the values in the list

print(list[0])>>:张三print(list[0:2])>>:[‘张三‘，‘李四‘]

3. Add element Append (), insert ()
3.1 Append () Append Data

list.append(231)

3.2 Insert () to add at the specified location

list.insert(1,‘马六‘)print(list)>>:[‘张三‘, ‘马六‘, ‘李四‘, 123]

4. Delete element Del,remove (), Pop ()
4.1 del

del list[0]print(list[0])>>:李四

4.2 Remove () by value

list.remove(123)print(list)>>:[‘张三‘, ‘李四‘, 231]

4.3 pop () is deleted according to the list subscript

list.pop(1)print(list)>>:[‘张三‘, 123, 231]

5.len () method, returns the list length

print(len(list))>>:4

6.sorted () method, for array sorting

list=[‘d‘,‘a‘,‘g‘,‘e‘]print(sorted(list))>>:[‘a‘, ‘d‘, ‘e‘, ‘g‘]

7.count () method to calculate the number of occurrences of an item of data in a list

list=[‘d‘,‘a‘,‘g‘,‘e‘,‘d‘]print(list.count(‘d‘))>>:2

8.extend () append another list to the end of the original list

list=[‘d‘,‘a‘,‘g‘,‘e‘,‘d‘]list1=[‘n‘,‘h‘]list.extend(list1)print(list)>>:[‘d‘, ‘a‘, ‘g‘, ‘e‘, ‘d‘, ‘n‘, ‘h‘]

9.index () The position in the list where the return value is located

list=[‘d‘,‘a‘,‘g‘,‘e‘,‘d‘]print(list.index(‘a‘))>>:1#如果有多个相同的值则返回第一个值的位置list=[‘d‘,‘a‘,‘g‘,‘e‘,‘d‘]print(list.index(‘d‘))>>:0

10.reverse () Inverse array

list=[‘d‘,‘a‘,‘g‘,‘e‘,‘d‘]list.reverse()print(list)>>:[‘d‘, ‘e‘, ‘g‘, ‘a‘, ‘d‘]

Python Basics-Lists (list)