Python

Total size of all files in the current directoryPass to the inside of the function and return to the outside of the function gradually.Lazy MatchingThe search algorithm of the Ii.Structured timeResolve output garbledWhich modules were loaded by the

1. There are 4 ways to express a string:Single quote: "'Double quotes: "Three single quotes: "'Three double quotes: "" "or" "Content in quotation marks is the contents of a string2. The difference between single and double quotation marks:Double

# coding=utf-8 #在列表末尾添加新的对像 #实例展现函数append () use alist=[456, ' abc ', ' Zara ', ' Ijk ', 2018] Alist.append (123) print ("Updated List:", alist) output result: Updated List: [456, ' abc ', ' Zara ', ' Ijk ', 2018, 123]

defAverage (values):"""Compute Average Value>>> Print (average ([+]))20.0>>>the above test syntax >>> needs a blank space, otherwise the test indentation errorafter the test, if the document also needs to write other comments, end with >>>,

Write routed Python code, let the Turing to play with you, feeling is not very intelligent.import osimport jsonimport urllib2class Chat(object):key = "申请的key" # turing123网站apiurl = "http://www.tuling123.com/openapi/api?"def

1 ImportPYMYSQL,XLWT2 defExport_excel (table_name):3Host, user, passwd, db ='118.24.3.40','Jxz','123456','Jxz'4Coon = Pymysql.connect (user=user,host=host,port=3306,passwd=passwd,db=db,charset='UTF8' )5Cur =coon.cursor ()6sql ='select *

Crawler to understandWeb crawler (crawler) is a program or script that automatically crawls the World Wide Web information according to certain rules.Installation of PythonThis tutorial uses Python3 to write, so you need to put a Python3 on your

What is CGICGI is currently maintained by NCSA, and NCSA defines CGI as follows:CGI (Common Gateway Interface), a universal Gateway interface, is a program that runs on a server such as an HTTP server, providing an interface with the client HTML

1. Mapping functionsitems=[1,2,3,4,5]def Inc (X):return x+1list (map (inc,items))[2, 3, 4, 5, 6] for in range (3)]>>> list (map (Lambda x:x+5, a))[5, 6, 7] 2. Filter function>>> List (filter ((lambda x:x>1), a))[2] 3. Statute function: Calculates

Simulate some interfaces that can be used to test the interface before it is successfully developedUsed to query data1. First interfaceImportFlask,json#__name__, which represents the current Python fileServer=flask. Flask (__name__)#take this Python

BeautifulSoup plug-in usageThis plugin needs to be installed using PIP first (no longer stated in the previous article), and then the reference in the program from Import beautifulsouphtml=self.requests (URL)# Call the requests function to pass the

First week of Python: _username = ' Alex '_password = ' abc123 'Username = input ("Username:")Password = input ("Paaword:")If username ==_username and password = = _password:Print ("Welcome to US system")ElsePrint ("error") determines if the

Tag: Set ATT value technology performs operation BSP subclass attrObject-oriented built-in methods (example)I, Isinstance (OBJ,CLS) and Issubclass (Sub,super)1. Check if BoJ is an object (instance)class Foo (object): Pass = Foo

Set type: unordered, inner element can only be immutable type, each element is different; set is a mutable type, but only elements can be added and removed, and elements cannot be modified;Add Element Method: Add (parameter added as an element),

Description of the problem encountered:An error occurred during the installation of AssemblyA microsoft.vc90. CRT, version=9-0.30729 1, publickey token= "1fc8B3b9ale18e3b,processorarchitecture= "AMD64", type= "Win32Please refer-to-help and support

Parser: Configuration resolutionThe function of this module is to configure parsing filesPS: Configuration file FAQ:A user profile is a collection of settings and files for the user to load the desired environment when the user logs on to the

First look at a few examples:#-*-coding=utf-8-*-a= "Hello python" b= "Hello python" print (A is b) #结果是: trueprint (A = = b) #结果是: truea=[1,2,3]b=[1,2 , 3]print (A is b) #结果是: Falseprint (a = b) #结果是: Truea=[1,2,3]b=aprint (A is b) #结果是: trueprint

5th Chapter1.first-class functionThe first-class here means that a function can act as an object and return in another function.Metaclass programming also has the concept of first-class class, which means that a class can be created as an object in

Pycurl is a powerful Python URL library, written in C, fast, faster than Urllib and Httplib. Today, let's take a look at the usage and parameters of Pycurl Common methods: Pycurl. Curl () #创建一个pycurl对象的方法 Pycurl. Curl (). setopt (Pycurl. URL, http:/

A recent requirement is the execution of a shell command on the page, The first kind is os.system, The code is as follows: Os.system (' Cat/proc/cpuinfo ') However, it is found that the results of the command printed on the page 0 or 1, of course,