The examples in this article describe Python list operations. Share it with everyone for your reference, the details are as follows:
#coding=utf8 ''''' 列表类型也是序列式的数据类型, 可以通过下标或者切片操作来访问某一个或者某一块连续的元素。 列表不仅可以包含Python的标准类型, 而且可以用用户定义的对象作为自己的元素。 列表可以包含不同类型的对象, 列表可以执行pop、empt、sort、reverse等操作。 列表可以添加或者减少元素, 还可以与其他列表结合或者把一个列表拆分成几个。 可以对一个元素或者多个元素执行insert、update或者remove操作。 元组和列表主要不同之处在于,前者不可变(只读), 那些用于更新列表的操作,就不能用于元组类型。 列表是由方括号([])来定义的,也可以用工厂方法list()创建它。 可以通过在等号左边指定一个索引或者索引范围的方式来更新一个或几个元素, 也可以通过append()方法追加元素到列表中去。 要删除列表中的元素,如果确切知道要删除元素的索引可以用del语句, 否则可以用remove()方法。 还可以通过pop()方法来删除并从列表中返回一个特定对象。 一般来说,程序员不需要去删除一个列表对象引用。 列表对象出了作用域后它会自动被析构,但如果想删除一整个列表,可以使用del语句。 ''' #创建列表 oneList=["one",1,2,23.6,"two"] #通过工厂函数创建list twoList=list("hello world") #创建一个初始化的表 threeList=[] #输出列表中的内容 print oneList,"\n",twoList #访问列表中的元素 #通过索引访问 print oneList[0],oneList[-1] #通过切片访问,默认间隔为1 print twoList[0:2] #通过切片访问,设置间隔为2 print twoList[0:5:2] #更新列表中的元素 #通过索引更新元素 oneList[0]="One" print oneList[0] #通过切片更新几个元素 twoList[0:5]=[1,2,3,4,5] print twoList[0:5] #调用append()方法,向list中追加元素 threeList.append(oneList) threeList.append("hello") print threeList #删除列表中的元素或列表本身 #del删除列表中某一元素 print len(twoList) del twoList[5] print len(twoList),twoList[5] #remove删除列表中某一元素 print len(threeList) threeList.remove("hello") print len(threeList),threeList #pop删除列表最后一个元素 #并把删除的元素保存为一个对象 print oneList.pop(),oneList #使用切片删除一定范围内的元素 print twoList del twoList[0:4] print twoList #删除一个列表引用 print twoList try: del twoList print twoList except Exception,e: print "twoList not exists"
Running results:
Readers who are interested in more Python related content can check the content of this site , thank you all for paying attention to me, I will continue to work hard.
The above is the detailed content of Python list operation example tutorial. For more information, please follow other related articles on the PHP Chinese website!

TomergelistsinPython,youcanusethe operator,extendmethod,listcomprehension,oritertools.chain,eachwithspecificadvantages:1)The operatorissimplebutlessefficientforlargelists;2)extendismemory-efficientbutmodifiestheoriginallist;3)listcomprehensionoffersf

In Python 3, two lists can be connected through a variety of methods: 1) Use operator, which is suitable for small lists, but is inefficient for large lists; 2) Use extend method, which is suitable for large lists, with high memory efficiency, but will modify the original list; 3) Use * operator, which is suitable for merging multiple lists, without modifying the original list; 4) Use itertools.chain, which is suitable for large data sets, with high memory efficiency.

Using the join() method is the most efficient way to connect strings from lists in Python. 1) Use the join() method to be efficient and easy to read. 2) The cycle uses operators inefficiently for large lists. 3) The combination of list comprehension and join() is suitable for scenarios that require conversion. 4) The reduce() method is suitable for other types of reductions, but is inefficient for string concatenation. The complete sentence ends.

PythonexecutionistheprocessoftransformingPythoncodeintoexecutableinstructions.1)Theinterpreterreadsthecode,convertingitintobytecode,whichthePythonVirtualMachine(PVM)executes.2)TheGlobalInterpreterLock(GIL)managesthreadexecution,potentiallylimitingmul

Key features of Python include: 1. The syntax is concise and easy to understand, suitable for beginners; 2. Dynamic type system, improving development speed; 3. Rich standard library, supporting multiple tasks; 4. Strong community and ecosystem, providing extensive support; 5. Interpretation, suitable for scripting and rapid prototyping; 6. Multi-paradigm support, suitable for various programming styles.

Python is an interpreted language, but it also includes the compilation process. 1) Python code is first compiled into bytecode. 2) Bytecode is interpreted and executed by Python virtual machine. 3) This hybrid mechanism makes Python both flexible and efficient, but not as fast as a fully compiled language.

Useaforloopwheniteratingoverasequenceorforaspecificnumberoftimes;useawhileloopwhencontinuinguntilaconditionismet.Forloopsareidealforknownsequences,whilewhileloopssuitsituationswithundeterminediterations.

Pythonloopscanleadtoerrorslikeinfiniteloops,modifyinglistsduringiteration,off-by-oneerrors,zero-indexingissues,andnestedloopinefficiencies.Toavoidthese:1)Use'i


Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Hot Tools

WebStorm Mac version
Useful JavaScript development tools

SublimeText3 Linux new version
SublimeText3 Linux latest version

SublimeText3 Mac version
God-level code editing software (SublimeText3)

Atom editor mac version download
The most popular open source editor

Dreamweaver CS6
Visual web development tools
