List is represented by [], which is the most frequent and most common composite data type in Python.
The positive and reverse index in the
list:
Features:
列 Each element in the list is variable (modified, deleted)
列 List is orderly, you can use indexes to access the specified element
The element in the
表 can be any object in Python, it can be a string, integer, a group, or a list
列 Cut in the medium value of the list can be used for variable [head bidding: tail bid], from left to right default 0, from right to left index default-1, the bid can be expressed as the head or get the head or the head or the head or the head or the head or the head or tail
9 + is a list connection operator, star number * is repeated operation
basic operation
list = ['play', 'algorithm', 'python', 2019, 12.02, 'python']
author_list = ['Tommy', 'ChaoChao', 'Wsqstar']
- Positive number operation, intercept the right side of the colon
Print ('Full List List:', List)
Print ('Second element list [1]:', list [1])
Print ('Second to Fourth Element List [1: 4]:', List [1: 4])
Print ('Third to the last element List [2:]:', list [2:])- Inconsistent operation, intercepting the right side of the colon
Print ('The second element List [-2]:', list [-2])
Print ('The last three elements list [-3:]:', list [-3:])
Print ('The second to the fourth element List [-4: -1]:', list [-4: -1])- Operation
Print ('Output List Two Author_List * 2:, Author_list * 2)
Print ('two list combinations list + author_list:', list + author_list)- whether the element exists in the list
Print ('Python is in the list:', 'python' in list)- iteration
Print ('iteration output Author_list each item:')
for item in author_list:
Print (item)- Output results
Full list list: ['play', 'algorithm', 'python', 2019, 12.02, 'python']
The second element list [1]: Algorithm
The second to the fourth element List [1: 4]: ['Algorithm', 'Python', 2019]
The third to the last element List [2:]: ['python', 2019, 12.02, 'python']
The second element list [-2]: 5.11
The last three elements list [-3:]: [2019, 12.02, 'python']]
The second to the fourth element List [-4: -1]: ['python', 2019, 12.02]
Output list twice Author_list * 2: ['Tommy', 'ChaoChao', 'WSQStar', 'Tommy', 'Chaochao', 'WSQStar']
Two list combinations + author_list: ['play', 'algorithm', 'python', 2019, 5.11, 'python', 'tommy', 'chaochao', 'wsqstar']
Whether python is in the list: true
Each item of iterative output Author_List:
Tommy
Chaochao
WsqstarBasic function
list = ['PLAY', 'Algorithm', 'Python', 2019, 12.02, 'Python']
int_List = [12, 22, 30, 13, 24, 1, 10, 10.3, -1]
Print ('List length len (list):', len (list))- max () and min () functions only support the list elements of the list and float that can calculate the value of the value
Print ('maximum value Max (int_List):', max (int_List))
Print ('minimum value min (int_List):', min (int_List))- Quickly turn a object to list
Print ("STR object to list list ('tommy'):", list ('tommy'))- Output results
List length len (list): 6
Max (int_List): 30
Minimum value min (int_List): -1
STR objects turn to list list ('tommy'): ['t', 'o', 'm', 'm', 'y', 'y']- basic method
list = [‘play’, ‘algorithm’, ‘python’, 2019, 12.02, ‘python’]
author_list = [‘Tommy’, ‘ChaoChao’, ‘Wsqstar’]
list.append(author_list)
Print
list.remove(author_list)
Print
list.insert(5, ‘Baidu’)
Print
list.extend(author_list)
Print
list.pop()
Print (“Remove an element, default the last element list.pop ():”, list)
list.pop(0)
list.pop ([Index = -1]) method is the same as Del. The following example can also be used in Del list [0]
Print ("Remove the first element list.pop (0):", list)
list.reverse ()
Print ("The list element reverse list.reverse ():", list)
Print ('' List sort, it is recommended to check the rookie tutorial to get a better description: ',' https://www.runoob.com/python/att-sort.html '))))
list2 = list.copy ()
Print ("list copy, I am list2 list.copy ():", list2)
list2.clear ()
Print ('list2 after clearing list2.clear ():', list2)
# Copy and use = different assignments, copying a new list, any operation of List2 does not affect List
Print ('list2 List:', list)
# When using = assignment, all operations will affect the list itself
list3 = list
Print ('I am a List3: ', List3)
list3.clear ()
Print ('list3 after clearing list3.clear ():', list3)
Print ('List3 is clear after empty:', list)- output results
Add new object list.append (Author_List) at the end: ['Play', 'Algorithm', 'Python', 2019, 5.11, 'Python', [Tommy ',' Chaochao ',' WSQStar ']]
Remove the first matching of a certain element list.remove (author_list): ['play', 'algorithm', 'python', 2019, 5.11, 'python']
Add new object list.insert (5, 'Baidu') at the specified location: ['PLAY', 'Algorithm', 'Python', 2019, 5.11, 'Baidu', 'Python']
Add the value in the batch to the end of the list to the end of list.extend (author_list): ['play', 'Algorithm', 'Python', 2019, 5.11, 'Baidu', 'Python', 'Tommy', 'CHAOCHAO', 'Wsqstar']
Statistically, the number of times that a certain element appears in the list list.count ('python'): 2
Find out the index position of a certain element List.index ('python'): 2
Remove an element, default the last element list.pop (): ['play', 'algorithm', 'python', 2019, 5.11, 'Baidu', 'Python', 'Tommy', 'Chaochao']
Remove the first element list.pop (0): ['Algorithm', 'Python', 2019, 5.11, 'Baidu', 'Python', 'Tommy', 'ChaoChao']
Reverse list.reverse (): ['chaochao', 'tommy', 'python', 'baidu', 5.11, 2019, 'python', 'algorithm']
List sorting, it is recommended to check the rookie tutorial to get a better description: https://www.runoob.com/python/att-sort.html
List copy, I am the list2 list.copy (): ['chaochao', 'tommy', 'python', 'baidu', 5.11, 2019, 'Algorithm']]
List2 after clearing list2.clear (): []
List2 after empty listing: ['chaochao', 'tommy', 'python', 'baidu', 5.11, 2019, 'python', 'algorithm']]
I am a List3: [Chaochao ',' Tommy ',' Python ',' Baidu ', 5.11, 2019,' Python ',' Algorithm ']]
List3 after clearing list3.clear (): []
List3 after empty listing: []