Python

A list1 loop traversal of the list NamesList = [' Xiaowang ', ' Xiaozhang ', ' Xiaohua '] for name in nameslist: print (name) Results Xiaowang Xiaozhang Xiaohua2. Using the While loop NamesList = [' Xiaowang ', ' Xiaozhang '

Hasattr (obj,attr) getattr (obj,attr) setattr (obj,attr,val)class People: def eat(self): print(‘eat‘) def drink(self): print(‘drink‘) def code(self): print(‘code‘)p = People() # p为指向类的实例hasattr(p,‘eat‘) #

Formatted output for string1 Print ('{0}+{1}={2}'. Format (1,2,1+2)) # inch 2 1+2=3 # outView CodeCorresponding parameters in curly bracesIf the number is omitted:Print (' {}+{}={} '. Format (1,2,1+2)) #inThe same output results can be

__init__ and __new__ differences1. From the point of transfer parameters, __init__ the first parameter is the instance itself, and __new__ passes the class itself2. From the execution order point of view, the __new__ method executes before the

One, tuple definitionCreate a tuple with ()Two, tuple and list differenceLists are created with [], tuples are created with ()Once the elements in the tuple have been defined, they cannot be changed, and the elements in the list can be modifiedThird,

I. Pure AND AND OR statements1. In a pure and statement, if each expression is not false, then the last one is returned because it needs to be matched until the last one. If there is a false, then return false2. In a pure or statement, the value of

#!/usr/bin/env Python#-*-Coding:utf-8-*-Import OSImport Sysdef get_dir (path):Print (path, ' \ n ')return Os.listdir (PATH)def bak_file (Path, Path_bak):List = Os.listdir (path)For L in list:File_path = Os.path.join (path, L)File_path_bak =

Use Os.listdir () to monitor the file directory:#!/usr/bin/env python#-*- coding=utf-8 -*-#filename:  monitor_dir.pyimport osimport timemonitor_dir =  "/opt/" Now_file = dict ([(F , None) For  f in os.listdir (Monitor_dir)]) while true:    new_file  

A collection is an unordered, non-repeating combination of data that has the following main functions:(1) Go to the weight, put a list into a set, and automatically go heavy(2) Relationship test, test the intersection between two sets of data,

AssertionAssert Self.driver.title.find (U "Sogou search engine") >=0, "Assert error"Browser back, forward, before moving forward to go backSelf.driver.back ()Self.driver.forward ()Browser forced refreshSelf.driver.refresh ()Maximize your browser

1. If the node type does not have the parent attribute, the successor node is obtained by the middle order traversal method1 defGetsuccessornode (Head, node):2 if( notNodeor( nothead):3 returnNone4stack = []5Flag =False6

The use of Python often inadvertently encountered very interesting usage, so deliberately collected someinteresting usage.1.for-else usageAn else statement is executed when the loop ends normally. Typically used to loop through the elements that

I. Introduction of PythonPython is an easy-to-learn and powerful programming language. It has efficient advanced data structures and simple and efficient object-oriented programming features. Python's elegant syntax and dynamic type, as well as its

1Imglist = ['11.jpg','12.jpg','13.jpg','14.jpg','2.jpg','1.jpg',]2 Print(str (imglist))3A = str (imglist). Split (".")4 Print(a)5Ftail =A.pop ()6 Print("-------------------")7 Print(Ftail)8 Print("----$%%%%%%%%---")9 Print(a)Ten One #alist = [123, '

QuestionsMost of the sequence of function calls involving multiple adorner decorations will indicate that they are top-down, such as the following example:defDecorator_a (func):Print 'Get in Decorator_a' defInner_a (*args, * *Kwargs):Print 'Get

Need to install a third-party package: RequestsThe latitude and longitude matching using the high-D map API, first of all, the GPS coordinates into the latitude and longitude coordinates of the German map, and then according to the converted

Python add fluent log, AOP implementation1. Configure Fluent related informationFluent_config.iniFluent_config.ini [FLUENT.AOP] #is support Fluent log   false #aop total Code class= "Java keyword" >switch fluent.aopstatus=

1. Use general recursion to obtain1 def Getnodenums (head): 2 if not Head: 3 return 0 4 Lnums = getnodenums (head.left)5 rnums = getnodenums (head.right)6 return lnums + rnums + 12. Recursive (Time complexity O (LOGN*LOGN))

This article is mainly for everyone in detail introduced the python2.7 to achieve the Crawler Web page data, with a certain reference value, interested in small partners can refer to Recently just learned Python, made a simple crawler, as a simple

This article mainly introduces the Python learning necessary knowledge summary of relevant information, the need for friends can refer to the following One, variable1. Variables• Refers to the amount of variable in the course of execution of the