Python

Last written the login program is disorganized, I can not see, the teacher made the comments as followsSince the current dictionary is not too familiar with the first time,And then joins in a while loop really worksBut the sense code is still more

#-*-coding:utf-8-*-#@Author: FELIX#@Date: 2018/5/18 16:19ImportQRCode fromPILImportImageurl='http://www.baidu.com'qr=QRCode. QRCode (Version=2, Error_correction=Qrcode.constants.ERROR_CORRECT_L, Box_size=8, Border=2) qr.add_data (URL)#Add

OS Module 1 os.getcwd () Gets the current working directory, which is the directory path of the current Python script work 2 os.chdir ("DirName") changes the current script working directory, equivalent to the shell under CD 3 Os.curdir returns the

Tuples: (tuple) elements cannot be modified, cannot be added or deletedWhen writing tuples generally, it is recommended to add a comma at the endCan index valuesYou can slice and take valuesTuple-level elements cannot be modified, but can be

1. Install PythonDownload the latest version of Python3 's installation package from the official Python website: http://www.python.org.Reference: http://www.cnblogs.com/yaoyaojcy/p/7349019.html2. Installing PycharmPycharm installation process

1. Fromkeys () creates a dictionary from a sequence and specifies a uniform valueDIC = Dict.fromkeys (['a'b' 'C ' ' def ' )print(DIC)Output: {' A ': ' Def ', ' B ': ' Def ', ' C ': ' Def '}2. Get () Gets the value according to key, when key does not

Introduction to the basic concepts of serialization:01What is serializationSerialization: Convert in-memory data into an intermediate format (Json/pickle) and store it on a hard disk for permanent storageDeserialization: Read from a file

PYOPENGL InstallationPackage Version------------------- -------NumPy Pyopengl 3.1.0 Pyopengl-accelerate 3.1.0 Demo11 #-*-coding:utf-8-*-2 fromOpengl.glImport*3 fromOpengl.gluImport*4 fromOpengl.glutImport*5 6

Path setting installation path (Environment)Simultaneous installation of py2.0 and py3.0Execute commands separatelypython-m pip Install (download)python-m pip install--upgrade pip (Download install pip)————————————————————————————python3-m pip

Singleton --an object created by a class that has only one instance in the system Defines a class property , the initial value None , that is used to record a reference to a singleton object overriding __new__ method If the class

1. Learning directory: Numbers (integer, long, float, plural) string list meta-ancestor dictionary Collection 2. Learning objectives: 1. Purpose 2. Method of definition 3. Common operations and built-in methods　　A. Shaping and floating-point

# This is a learning note for the Liaoche teacher Python tutorialSockets are an abstract concept of network programming. Usually we use a socket to indicate "open a network link", while opening a socket needs to know the destination computer's IP

# This is a learning note for the Liaoche teacher Python tutorialFor an unknown encoded bytes, to convert it to STR, you need to know how to encode the bytes. We can use Chardet This third-party library to detect the encoding1) Direct detection

One, str commonly used methods are: (In the Pycharm interface, in the location of the method by Ctrl + Left to view the details of the method of use information )Len,count,

# This is a learning note for the Liaoche teacher Python tutorialMost of the time, data read and write is not necessarily a file, but also can read and write in memory.1 , StringioStringio, as the name implies, reads and writes STR in memory.1.1 ,

Pycurl Module InstallationPip Install PycurlSource Installation Method:wget https://curl.haxx.se/download/curl-7.29.0.tar.gzTar zxf curl-7.29.0.tar.gzCD curl-7.29.0/./configureMake && make installExport Ld_library_path=/usr/local/libwget

# This is a learning note for the Liaoche teacher Python tutorial1. OverviewTo write maintainable code, we group many functions into separate files so that each file contains relatively few code, and in Python, a. py file is called a module.1.1 ,

Overall Note: Ctrl +?1. Operators+-*///(pick-up)* * (Power)% (redundancy)Determine if something is contained in something: in NotNot equal to:<>!=A=a+1 equals A+=1.A=a-1 equals A-=1.a=a%1 equals A%=1.The result is a valueArithmetic operationsA = 10 *

Today the leader asked why with Golang, colleagues to answer grammar simple, language new, support high concurrency. That high concurrency in the end how to achieve, the following article is mainly about how to use Golang to write high-concurrency

Scrapy, a Python-based web crawler framework that crawls information from the Web, is a good way to get data. So I want to install the next look. Go to its official website, install the introduction page There are 3 kinds of loading method, one