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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 change:(1) Increase in list: Add a single element Append method: This method is used to append a new object to the end of the list: >>> list=[1,2,3,4,

Other Statement 1 in the notes of the basic python Tutorial: python loop statement Print-related Print can print multiple expressions, as long as they are separated by commas (,), a space is inserted between each parameter in the result. Use + to avoid spaces, as shown in figure >>> Print 'Age: ', 42Age: 42>>> Print 'hello' + ',' + 'World'Hello, world Add a co

#创建phone={'Alice':'12234','beth ' :'352235'}#dict使用items=[('name','gumby'), ('age' ,}d=dict (items) d=dict (name='gumby', age=42)#基本字典操作lend (d) d[k]d[k]= in dx={}x[42]='foobae' x{:'foobar'}people={'Alice':{'Phone':'123','Addr':'Foo drive34'},'Beth':{'Phone':'23234','Addr':'3123'}}labels={'Phone':'Phone number','Addr':'Address'}name=input ('Name:') Request=input ("phone Number (p) or address (a)?:")ifrequest=='P': key='Phone'ifrequest=='a': key='Addr'ifNameinchPeople:Print("%s '%s ' is%s."% (Nam

Look at this article, I assume you've all learned Python (Pesonton Opliton), and the following knowledge is the Python extension (framework).In this introductory tutorial, we assume that you have installed scrapy. If you are not yet installed, please refer to the Installation Guide.We will use the Open Directory Project (DMOZ) as an example of crawling.This intro

right, divides str into substrings with a space divider (separator), and splits the max times in total. Returns the resulting substring in a table. You can Str.rsplit (', ') by using commas or other delimitersStr.join (s) returns: The elements in S, with Str as the delimiter, are merged into a string.Str.strip ([Sub]) returns: Removes whitespace at the beginning and end of the string. You can also provide a parameter sub, removing the sub at the beginning and end of the stringStr.replace (Sub,

This article mainly introduces some features of HackerNews in the Python Django framework, including voting "top" comment and other features. For more information, see Step-by-step instructions This is the video text version provided to those who prefer reading. We will create a social news website similar to Hacker News or Reddit. It will be called "steel rumors" as a place to share interesting stories about "Iron Man" and vote on it. Overview of th

#列表可修改, the Yuan Zu cannota=['sdsd',]b=['SDS',]c=[a,b]#分片 :-#list函数#分片赋值#列表方法Lst.append (4) X.count (1) x.count ([up]) A.extend (b) a.index ("w" ) A.insert (3, "all")X.removeX.reverseX.sort#pop removes the list element and returns a value. Implementation data structure-stack, LIFO (LIFO), X.append (X.pop ()), FIFO, X.insert (X.pop (0)#sortX.sort (Key=len)y=sorted (x)#y元祖No list-like methods(a)#tuple函数# become a meta-ancestorPython Basic Learning Note--pytho