Python

0 PrefaceAccidentally found that Google included in the school test clock system interface, just to do database lesson set, then take as environment.The computer room incredibly loaded python, has long been told that Python crawler speed first-class,

Using Python to do a word frequency statisticGitHub address: Fightingbob "Give me a star, thanks." Word Frequency statistics Statistics on the number of English words appearing in plain English text files "Eg: Walden Pond (English

1 Installation Tools2 Generate normal QR code3 Two-dimensional code with pictures4 animated GIF two-dimensional code5 using in Python programsFirst, installationFirst run in the Python environment,Open cmd into python27Enter scriptsThen enter the

Application of Function nameA function name is a variable, but it is a special variable that can be executed in conjunction with parentheses.1. memory address of Function name1 def func (): 2 Print (" hehe ") 3 Print # function func at 0x02969c90

collection (set)Collection, save a lot of data, can not repeat features: unordered, non-repeatable, content can be hashed, itself is not hash k = fRozenset (collection): It's going to be a hash.Increase:S.add (content) s.update ("content"):

Python Learning-functionsTags: python functionsDirectory[TOC]I. Processing of documentsPython's built-in function, open, provides the ability to manipulate files. The open function invokes the OS's system interface to get a class file Object F,

One, yesterday content review 1. Concepts and theoriesProcess is the smallest unit of computer resource allocationProcess three-state, synchronous, asynchronous, blocking, non-blocking2. Creation of processesInstantiation, self-built class Run,start,

First, the functionFunction: The function is the encapsulation of a block of code, the program will skip the function when the function is called, we can use the function to encapsulate some fixed function, convenient for us to call later, this

1. GeneratorUsing iterators, we can generate the data in each iteration (through the next () method) and follow a specific pattern. But when we implement an iterator, we need to record the current iteration to the state we want to generate the next

Summary: Functional application Scenarios –> separate and no shared data between functions.Object-oriented three major featuresthe three major characteristics of object-oriented are: encapsulation, inheritance and polymorphism. first, the

URL Manager moduleIt is generally used to maintain crawled URLs and URLs that have not been crawled, and if the URL of the current crawl already exists in the queue, there is no need to repeat the crawl, in addition to prevent a dead loop. As an

1 high-level language: Python java ... Generate byte code2 Low-level languages: C-Compilation ... Generate machine code3 Low-level language love high-level language, because most of the high-level language is written in low-grade language, so the

(1): How to add a Python third-party library (method one):File->> Settings ...->> Project interpreter(2): How to add a Python third-party library (method two):Steps:1, the win key +r, input "cmd" to bring up the command window;2, enter: python-m pip

One or three-dollar operationFormat: Object = value 1 if condition else value 2 assigns value 1 to object when condition is set, and vice versa assigns value 2 to object>>> name = 1 if True else 2>>> name1>>> name = 1 if False else 2>>> name2General

involving knowledge points1. Crawl Data2. Paging crawlerLaw analysis1, crawl the data, found that each item is Data-tools label2. Pagination AnalysisCodeimport requestsfrom bs4 import beautifulsoupimport reimport jsonimport  jieba# get HTML page

Brief introductionAs the saying goes 工欲善其事 its prerequisite, so for programmers, the use of Python programming must have a powerful Python programming tool, this tool is pycharm.Pycharm is a Python IDE with a complete set of tools to help users

I suddenly found a very serious problem, I seem to have told you a lot of Python syntax, but did not tell you the basic Python background. Today, we don't learn basic grammar, and look at the basic background of Python.First, say how Python reads.

Second, Python is only suitable for testing?As to what kind of language Python is, it is not intended to speak of terms such as objects or classes. We can start by looking at the areas in which Python is used today: Telecommunications

Brief introductionPython's Colorama module, which can be used to display different colors and backgrounds across multiple terminals, requires only the Colorama module to be imported, without having to assign colors like Linux every time.1.

The main contents of this section : 1. Is== the difference 2. encoding problem ? difference between. is and = =1. ID ()by ID () we can see the value of the variable table? The address in memory Note----python , command?