python delete item from list

[Python Notes] usage of list, tuple, set, and dict in python: pythontuple List List is an ordered set (or a list) that allows you to easily add and delete elements. >>> Classmates = ['M

This article mainly introduces the basic operations of Python list, dictionary, and string. This article summarizes the most basic and commonly used operations, for more information, see create a list. The code is as follows: Sample_list = ['A', 1, ('A', 'B')] Python list o

Let's take a look at the dictionary built-in method Method Name Operation Dict.clear () Delete all elements in a dictionary Dict.copy () Returns a copy of a dictionary (shallow copy) DICT.FROMKEYSC (Seq,val=none) Creates and returns a new dictionary, which is the key of the dictionary in Seq, and Val does the initial value for all keys in the dictionary (none is default if this va

' Append elements to the end of the list: Classmates.append (' Jerry ') Classmates [' Joe ', ' Bob ', ' Tom ', ' Jerry ']To delete the elements at the end of the list, you can use POPs (). Classmates.pop () (there is no argument inside the parentheses, default is to delete the end of the element) ' Jerry ' Clas

List sorting instances in Python and python sorting instances In many cases, we need to sort the List. Python provides two methods to sort the given List L: Method 1. sort by the List m

This article mainly introduces the application details of python dict, set, list, And tuple. For more information, see this article, the tuple application and corresponding examples help readers understand its concepts and principles. The details are as follows: 1. Dictionary (dict) Dict surrounded {}Dict. keys (), dict. values (), dict. items ()Hash (obj) returns the hash value of obj. If it is returned,

key is ' 2 ' of 1 pairs of dictionaries Dict.popitem () # Random Delete no eggs with dict.get (' 1 ') # Safe to get value there is a return without a noneprint (' 1 ' in The cycle of a dictionaryFor i in Dict: print (i,dict[i]) # loop his key I corresponding to the dict[i] corresponding value6. Ternary operatorsA = 1b = 2c = 3d = A If a>b else C # has a value equal to if a is greater than B assigns a to D otherwise C assigns a value to DThe nex

Python provides three common methods for deleting duplicate elements in the list. This example describes three common methods for deleting duplicate elements in the Python list. We will share this with you for your reference. The details are as follows: If a list is specifie

the list in reverse order. List. sort (function (): sorts the list. Dictionary (dict) The dictionary contains data from curly braces {}. The curly braces contain keys and values. A pair of keys and values is an item, keys and values are separated by colons. items and items are separated by commas. An empty dictio

The list is very common in python and is very useful, so let's take a look at it today. First we need to remember two points: (1) The list is mutable (2) the list is suitable for all types of sequences, not just stringsNext we introduce the list of additions and deletions to

"tuple 'object does not support item assignmentEight. Create a cell element tupleTuple and list, can contain 0, one and any number of elements.A tuple that contains multiple elements, which we have created earlier.A tuple of 0 elements, which is an empty tuple, is represented directly by ():>>> t = ()>>> print t ()What about creating a tuple with 1 elements? To try:>>> t = (1)>>> print t1It seems to be wr

>>> Lst [4]Traceback (most recent call last ):File" ", Line 1, in Lst [4] IndexError: list index out of range Use-1 as the index to directly obtain the last element: The code is as follows: >>> Lst [-1]False>>> Lst [-2]5.44>>> Lst [-3]'Python'>>> Lst [-4]'Update slowness'>>> Lst [-5]Traceback (most recent call last ):File" ", Line 1, in Lst [-5] IndexError:

Like a single-linked list, it just adds a pointer to the previous element.：Python implementation code:#Personal Python Data Structure--ppds##!/usr/bin/python#-*-coding:utf-8-*-classNode (object):def __init__(self,val,p=0): Self.data=Val Self.next=P Self.prev=Pclasslinklist (object):def __init__(self): Self.head=0defini

Baptism of the soul, practice python (6)-live code + list, python live Active usage: Use input built-in functions Note: In python2 and python3, the input function is not the same. In python2, the input type is the same as the input type, and in python3, the input type is the string, this is the same as the raw_input function in python2, and there is no raw_input

between 3 and 5 inserted 4 on the line, listening is very convenient. So what is the structure of the list? As the name implies, the list is, of course, like a chain, linked together by a node, forming a data chain. The nodes of the linked list are structured as follows: Data is custom, and next is the address of the next node. The structure of the

= (' Yan Xia Ting Yu '). Split ()Print (name_list)Name_list.insert (3, ' Hello Insert ')Print (name_list)[' Yan ', ' xia ', ' ting ', ' Yu '][' Yan ', ' xia ', ' ting ', ' hello Insert ', ' Yu ']Way OneName_list.remove (' new_element ')Way TwoName_list.append (' new_element ')Del name_list[name_list.index (' New_element ')]Print (name_list)List.pop () Delete the last elementList.pop (n) specifies the subscript, deleting the specified element, and if d

Python entry list and metadata The main difference between a list and a group is that a list can be modified, but a list cannot be modified. In general, the list can replace tuples in almost all cases. For example, the sequence ca

This article mainly introduces the differences and usage of the built-in data types list, tuple, dict, and set in Python, which are all very basic knowledge and meticulous and comprehensive, if you have any need, refer. The Python language is concise and clear, and you can use less code to implement the same function. The four built-in data types of