Python

Python Three-level menu optimizer, newbie link: http://www.cnblogs.com/xuyaping/p/6648170.html 123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960 menu ={    ‘北京‘:{        ‘

The definition of a tuple.Use () to define.Null_tuple = () #定义一个空元组One_element = (' one ',) #定义一个元素的元组, note: Only an element must be followed by a comma Modify, increment, and delete elements of a tuple.Tuples are not allowed to modify, add and

Single quotes are exactly the same as double quotes; For example:Print (' Hello, world! ')Print ("Hello, world!")The execution results are output: hello,world!Three quotation marks can indicate that the logout and text can span lines, for example:1.

1 #python List2 3 #reverse Reverse Order4 #remove Delete the specified5 #clear Remove All6 #index The first subscript of the element7 #count The number of occurrences of this element8 #pop Delete the specified element and return it9 #insert

Import TimePrint(Time.time ())#1970 to present time, in the form of seconds#Time.sleep (1) # delay, CPU not workingPrint(Time.clock ())#Calculate CPU Execution TimePrint(Time.gmtime ())#structured time, UK world standard TimePrint(Time.localtime ())#

Students are sorted by name, sorted by scoreFrom operator Import Itemgetterstudents=[(' Bob ', ' Max '), (' David ', ' Dacheng '), (' A ', '), (' Maxie ', 94)]Sorted (students,key=itemgetter (0))Sorted (students, KEY=LAMBDA t:t[1])#sorted

#/usr/bin/python#coding =utf8# @Time: 2017/11/11 3:15# @Auther: Liuzhenchuan# @File: OS module. PYimport os #1. Get the operating system type via OS Os.name = Windows is NT type, Os.name = Linux is a POSIX typeprint(os.name) #2. Executing system

First starting from 2 the natural number sequence2,3,4,5,6,7,8,9,10,11,12,13,14 ...Excluding multiples of 2 and 2, Odd series3,5,7,9,11,13,15,17,19 ...Reject multiples of 35,7,11,13,17,19Reject multiples of 5, and so on#创建一个奇数序列Def Jishu ():N=1While

I. Commands module1.commands modules are only used with Linxu shell modein our usual code word, often need to call the system script or system command to solve many problems, next, we introduce to you a very good module commands, can call the system

The Python environment is built in addition to Python itself, as well as the installation of Aptana and PIP. Aptana provides a better integrated development environment, and PIP is primarily used to install third-party packages.The specific

First, python operations Excel , Python operations Excel uses XLRD, XLWT, and xlutils modules, XLRD modules are read in Excel, XLWT modules are written in Excel, and xlutils is used to modify Excel. These modules are installed using PIP, the

dictionary (dict): The combination of unordered data that exists as a key-value pair is a dictionary, why do you say that, we all know that we have learned that the series such as lists, sets, etc. are only a single data can be stored, if you want

Anonymous Functionsanonymous functions: "One sentence function" designed to address the very simple requirements of functions# Initial Code def Calc (n): return n**nprint(calc# to anonymous function lambda n:n**nprint(Calc (10))It's an analysis

OSI seven-layer model (open System interconnection, open systems interconnect)Application Layer Presentation Layer TCP,UDP Layer Transport Layer Network layer ip,icmp Data link layer MAC address physical layer physical network

What is--socket?A socket is an intermediate software abstraction layer that the application layer communicates with the TCP/IP protocol family, which is a set of interfaces. In design mode, the socket is actually a façade mode, it is the complex TCP/

Default recursion Maximum 1000Do not modify the default recursive maximumOften recursion is linked to the loop.People understand loops, God understands recursionAlgorithmrecognize recursionHow does the recursive function read?examplesAlgorithm: A

　　Containers that store large amounts of data in Python are called built-in data structures Python has four data structures: list, dictionary, tuple (array), set list: List=[val1,val2,val3,val4] Dictionary: Dict={key1:val1,key2: VAL2} tuples: tuple=

First, built-in functionsBuilt-in functions in detail: http://www.runoob.com/python/python-built-in-functions.htmlSecond, anonymous functionAn anonymous function is a specified function that does not need to be displayed#这段代码def Calc (n): return

(reprinted from http://blog.csdn.net/kellyseeme/article/details/50644893) 1, Code layout design 1.1 indentA, use four spaces to indentB, the line can be used when the backslash, the best way is to use the square brackets, when using a backslash, the

Print ("'Hello Word‘‘‘)Hello WordPrint ("Hello \nwoerd")HelloWoedPrint ("Hello \\nword")Hello \nwordPrint (r "Hello word\n")Hello work\nA= "Dogs"Print ("Hello%s"%a)Hello DogsA=123Print ("Hello%d"%a)Heelo 123A=123Print ("Hello%i"%a)Hello 123String