Python

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Python Operation zip fileNeed to use to ZipFile moduleRead zip fileAny zip file, I use Bb.zip here, is a folder BB, there is a file aa.txt.Import ZipFile# default mode R, read Azip= ZipFile. ZipFile (' Bb.zip ')# [' bb/', ' bb/aa.txt ']# return all

Index IntroductionOne: Why to have index index is used to optimize query efficiency (speed) of no index, for big data tables, can only be traversed each time, the larger the amount of data, the more time there are indexes, you can improve several

Three main characteristics of object-oriented: inheriting polymorphic encapsulationInitial knowledge Inheritance:Subclasses and subclasses instantiate objects that can call any method and variable of the parent classThe class name can access all the

This article turns from https://www.cnblogs.com/cenyu/p/5713686.htmlHasattr (object, name)Determines whether an object has a Name property or a name method, returns a bool value, returns true with the name attribute, or FALSE.It is important to note

Print (TRAIN_SET.TDM) Print (Type (TRAIN_SET.TDM))The output gets:(0, 3200) 0.264940780338(0,1682) 0.356545827856(0,3875) 0.404535449364(0,2638) 0.375094236628(0,2643) 0.420086333071(0,558) 0.332314202381(0,2383) 0.215711023304(0,3233) 0.30488464

Code:1 #x= ' Hello '2 ## Print (dir (x))3 #iter_test=x.__iter__ ()4 #5 ## Print (iter_test)6 #print (iter_test.__next__ ())7 #print (iter_test.__next__ ())8 #print (iter_test.__next__ ())9 #print (iter_test.__next__ ())Ten #print (iter_test.__next__

The method of decorating is changed into a static method by @staticmethod Adorner, what is static method? In fact, it is not difficult to understand, the ordinary method can be called directly after instantiation, And in the method can pass self.

Class namespace, query orderObject properties: Find from Object space first, can't find it again from class space, can't find, find from parent classClass Name properties: First find from this class space, if not found, then from the parent class to

Query Order: Object. Properties: First find from Object space, if not found, then from the class space to find, and then find, and then from the parent class to find .... Class name. Properties: First find from this type of space, if not found,

The ancient desire Mingmingde in the world, first to govern his country, to govern his country, first to his home, to his family, to fix his body, to fix his body, to be his heart, to be his heart, to first be sincere, to be sincere, to know in

One, Time module1#time.time () timestampPrint (Time.time ())2#time.localtime (second) plus second (timestamp) transforms the structured time without displaying the current structured timePrint (Time.localtime ())Print (Time.localtime

RESTful APIRESTful API is a resource-oriented programming, also called Representational State transfer (English: representational, Transfer, or rest).Think that all the things on the network are resources, the operation of resources is nothing more

1. Properties of the class :#/usr/bin/env#coding = Utf-8classChinese:#The properties of the class are in thisCountry =' China' def __init__(self, name):#The properties of the instance are in thisSelf.name =namedefPlay_ball (self, Ball):Print('%s

First, the function1. Function definition: function is a programming method of logical structure and processFunction Composition:1 function definition methods in Python:2 defTest (x):3 "The function Definitions"4X+=15 returnx6 def: Defines a

Save some of Python's most common interview questions here, but you can also do it in other languages!1. List to go to heavy1 """2 There is a list of [11, 2, 3, 3, 7, 9, 11, 2, 3], to remove the weight and keep the original order.3 """4 5L1 = [11, 2,

First, the number int Int.bit_length () used to calculate the number of bits that the number occupies in the binary form.        A = 9 # 9 binary is 1001b = a.bit_length ()print(b)Results:4Second, String str Str.upper ()

1, *args#positional parameters, functions for calculating X2defPower (x):returnX *XP= Power (5)Print(P)#change Power (x) to power (x, N) to calculate xndefPower (x, N): s= 1 whilen >0:n= N-1s= S *xreturnSP1= Power (5, 2) P2= Power (5,

Added elements of the listL1 = [10, 20, 30]L1.append (40) # appends an element with a value of 40 to the endL1.extend ([50, 60]) # Appends a series of elements to the end, extend + iterates over an objectL1.insert (Len (L1), 70) # Inserts an element

e-mail ideas (borrowing from third-party services):1, Simulation server , including: Server address, sender address, sender's password2. Create an instance with an attachment:1, create a massage 2, massage including the sender's address, the