remove element from list python

Recently, bloggers want to use Python to remove repetitive or similar SQL when analyzing database slow query logs, so you don't have to look at a lot of similar SQL. Repeating the same data is simpler and can be done using the built-in set command. For example: L1 = [' A ', ' B ', ' C ', ' d ', ' e ', ' A ', ' B ', ' F ']L2 = List (set (L1))Print L2 This is ea

Let's look at an example:Test1 = [' A ', ' B ', ' C ', ', '] for in test1: if': test1.remove (i) #删除空元素 Print (test1)>>>[' A ', ' B ', ' C ', ']At this point, we found that we did not achieve the results we want, the reasons are as follows:To understand the data structure of a Python list, the list belongs to

])#指针对应的下标为2, because of the displacement, the second traversal of the value of I directly points to the second position, is also 33, the pointer points to the third element of the new list, that is, the initial state of the 5th Element 5, and then 5 is deleted, so only [2,4]#第一次: A=[1,2,3,4,5]->a=1 The second:a=[2,3,4,5]-> of the pointer takes place i=3 the thir

Let's take a list of elements of a string as an example, and delete the elements:>>> l = [‘no surfing‘, ‘flippers‘] 1 Law One: Remove (val)>>> l.remove(‘no surfing‘)>>> l[‘flippers‘] 1 2 3 (1) The parameter of remove () is a specific element value, not an index, (2) If

We take a list of element types as an example, and we do the deletion of the listing elements: >>> L = [' No surfing ', ' flippers '] Law I: Remove (val) >>> l.remove (' no surfing ') >>> l [' flippers '](1) The parameter of remove () is a specific element value, not an i

#-*-Coding:utf8-*-‘‘‘__author__ = ' [email protected] '19:remove Nth Node from End of Listhttps://oj.leetcode.com/problems/remove-nth-node-from-end-of-list/Given A linked list, remove the nth node from the end of the list and retu

', ' 0 ', ' 0 ', ' 1 ', ' 24 ', ' 3 ', ' 0 ', ' 0 '],[' 50001 ', ' 0 ', ' 0 ', ' 20100506 ', ' 20141230 ', ' 1 ', ' 2 ', ' 67 ', ' 0 ', ' 0 ', ' 44 ', ' 6 ', ' 1 ', ' 4 ', ' 1 '],[' 69001 ', ' 0 ', ' 0 ', ' 20100524 ', ' 20150129 ', ' 16 ', ' 20 ', ' 90 ', ' 2 ', ' 220 ', ' 236 ', ' 44 ', ' 18 ', ' 3 ', ' 2 '],[' 71001 ', ' 0 ', ' 2 ', ' 20100526 ', ' 20141224 ', ' 9 ', ' + ', ' 0 ', ' 0 ', ' arrays ', ' 4 ', ' 7 ', ' One ', ' Every_list ']]for: #add col num ber for I in range (len (every_list

when P1 goes to the last element of the list, P2 goes to the bottom of the n+1 element, and P2.next jumps to the end of the table.Note that the judging condition is that p1.next is not none, so it is a protection to judge whether the P1.next is none in the while loop.Another is to pay attention to the situation of special case, the small white my habit is at the

List1 = [' 122 ', ' 2333 ', ' 3444 ', ', ', None]a = List (filter (None, List1)) # can only filter null characters and Noneprint (a) # [' 122 ', ' 2333 ' , the ' 3444 ']# python built-in filter () function-Filters list# filter () applies the incoming function to each element sequentially, and then determines whether

When using the Python list, we need to learn many key points. Next we will look at how to use the Python list. The Python list is a set of values of any type, which are combined in a certain order. The value of the

Title: http://oj.leetcode.com/problems/remove-duplicates-from-sorted-list/ Given a sorted linked list, delete all duplicates such which each element is appear only once. For example,Given 1->1->2, return 1->2.Given 1->1->2->3->3, return 1->2->3. Title translation: Given an ordered

Someone will encounter this kind of problem, traverse the list, want to delete some elements of the list, after execution found that some are not deleted to,such as the following codea=[1,2,3,4,5,6]Print (a) for in A: ifor i==4: a.remove (i)Print (a)The main thing to look at in code is to delete the 3 4 elements in the A list.The result of the program is:[1, 2, 3, 4, 5][1, 2, 4, 5]The result is un

title :Given a sorted linked list, delete all nodes that has duplicate numbers, leaving only distinct numbers from the Original list.For example,Given 1->2->3->3->4->4->5 , return 1->2->5 .Given 1->1->1->2->3 , return 2->3 .code : OJ online test via 288 ms1 #Definition for singly-linked list.2 #class ListNode:3 #def __init__ (self, x):4 #self.val = x5 #Self.next = None6 7 classSolution:8 #@param head, a

This article mainly introduces the use of the Remove () method to remove elements in the Python list of tutorials, is the basics of Python primer, pay attention to its and pop () method difference, need friends can refer to the The Remo