Python

1. Installing the Pymysql module2, the code is as followsImport pymysql# 1, connect database account, password IP port number Database # 2, build cursor # 3, execute sql# 4, get result # 5, close cursor # 6, connect Close coon = Pymysql.connect

#数据准备List1 =range List (List1)[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]map FunctionYou can manipulate an iterative object, and the output is also an iterative objectdef f_map (x): Return x**2# using the map function list2=map (f_map,list1) List (LIST2)[0, 1, 4,

1. Change the first letter of the string to uppercase　' Welcome to Bokeyuan ' = s.capitalize ()print ()2. Turn string all to case' Welcome to Bokeyuan ' = = = S.lower () print (S2) print (S3)3. Center The character, you can add a fill to replaces

ImportCopy a= [1, 2, 3, 4, ['a','b']]#Original Objectb= A#assignment, a reference to a passing objectc = Copy.copy (a)#object Copy, shallow copyD = Copy.deepcopy (a)#object Copy, deep copyA.append (5)#Modify Object AA[4].append ('C')#Modify the [' A

First, the index1 li = ["trony""shi""nvshen" "nanshen"]2 li = li[0]3 Print(LI)4 >>>tronyIndexSecond, slicing1 #List Index "Gu Tou regardless of tail"2Li = ["Trony","Shi","Nvshen","Nanshen"]3L1 = Li[0:2]4 Print(L1)5>>>["Trony","Shi"]6L2 = Li[0:-1]7

Data typeA computer is a machine that can do mathematical calculations as the name implies, so a computer program can handle a variety of values. However, the computer can handle far more than the numerical value, but also can deal with text,

Experience0) generally in the more formal class of the constructor. There will be a Verify_args function to validate the incoming parameters. Especially for system parameters.1) and the system, in fact, the back is probably a function of the nameFor

more on wind control modeling, big data analysis and other content please pay attention to the public number "big data wind control bit by bit"After the variable is split, the importance of the variable is calculated, and IV is one of the statistics

an object that can be called by next() a function and continually returns the next value is called an iterator: Iterator . An object that can directly act on for a loop is called an iterative object: Iterable .forThere are several types of data that

1. Condition Judgment:There is only oneIf***Elif: #多个条件加elif, want to add a few plus a few****Else****Python is indented to represent the statement block, see the colon, the downside is to indent2. CirculationTwo types, for and whileFor I in Rangle (

Local variables and global variablesIf the content of the function has no global keyword, the local variable is read first, the global variable can be read, the global variable cannot be re-assigned, but for the mutable type, the inner element can

1 #-*-coding:utf-8-*-2 """3 Created on Thu 13:53:10 20184 5 @author: Frank6 """7 8 Importxlrd #XLRD is a library for reading data and formatting information from Excel files, whether they is. xls or. xlsx files. 9 Tendata = Xlrd.open_workbook

Python makes the word cloud (wordcloud) 1. Installation 某个教程给出的方法，到[这里][1]下载相应的wordcolud，然后到相应目录pip安装。 其实直接PIP INsTaLL WoRDCLouDOK, go to Python. Import Wordcloud success.# #2. Brief description of the documentThere are 3 main functions that can be

Brief introductionConfigParserThe module is modified in Python3 to configparser . This module defines a Configparser class that functions as a configuration file, and the format of the configuration file is the same as the format of the Windows INI

This section reads as follows: About Atom Download Install Atom Installing the Python development package Developing Python programs using atom About AtomAtom is a free, very powerful editor developed by GitHub that can

Error:Solution:Use Image: Pip install xxxx-i https://pypi.douban.com/simple such as: PIP3 install--upgrade tensorflow-i https://pypi.douban.com/ Simple error message: Traceback (most recent call last):File "d:\programs\python35\lib\site-packages\pip\

First, the definitionObject-oriented is a programmatic approach that is implemented based on the use of classes and objectsClass: A kind, a model.Object: Refers to the specific thing, the model is made of things called objects.Instance: the instance

　　Blog Address: http://www.cnblogs.com/yudanqu/1, can iterate objects Before we introduce iterators, let's talk about an iterative object (iterable), which is an object that can act directly on a for loop. So what can be used directly

2018-05-24 23:05:31Operating systemReference: https://www.cnblogs.com/linhaifeng/p/6295875.htmlPython basic syntaxReference: http://www.cnblogs.com/linhaifeng/articles/7133167.htmlOperating system1, what is the operating systemAn operating system is

This article mainly introduces Python to realize the simulation of large files and multi-threaded processing methods, involving Python file reading, segmentation and multithreading related operation skills, the need for friends can refer to the next