most useful python modules

0. DescriptionModules are used to organize Python code methods, while packages are used to organize modules, making the best use of packages and modules will facilitate the development of large, clearly structured programs. 1. What is a moduleThe so-called module, in fact, is a. py file that contains a specific function code, in this. py file, the following

follows:1 menu_dict={2 "Henan province": {3 "Jiaozuo": {4 "Xiuwu County": {"AA", "BB", "CC"}, 5 "Wuzhi County": {"DD", "EE", "FF"}, 6 "Boai County": {" GG "," HH "," II "} 7 }, 8 " Xinxiang ": {9 " Hui County ": {" AA "," BB "," CC "},10 " Fengqiu County ": {" DD "," EE "," FF "},11 " Yanjin County ": {" GG "," HH "," II "}12 }13 },14 " Hebei province ": {" Xingtai ": {

: Specifies the formats and contents of the output, format can output a lot of useful information, as in the example above:% (Levelno) S: Print the value of the log level% (levelname) S: Print log level name% (pathname) s: Prints the path of the currently executing program, which is actually sys.argv[0]% (filename) s: Prints the current name of the executing program% (funcName) s: Print the current function of the log% (Lineno) d: Print the current li

a module㈠ What is a module?A module is a file that contains the Python definition and declaration, and the filename is the suffix of the module name plus the. Py.Why do ㈡ use modules?If you quit the Python interpreter and then re-enter, then the functions or variables you defined previously will be lost, so we usually write the program to a file so that it can be

1. Module1. In Python, a. py file is called a module.2. Large Greatly improves the maintainability of the code. 3. Writing code does not have to start from scratch. When a module is written, it can be referenced elsewhere650) this.width=650; "src=" Https://s5.51cto.com/wyfs02/M00/9B/EE/wKioL1lo0KaR-BsyAABCJMRCmbs721.png "title=" 50RCY ]iyfqpb3duehk ' J}s5.png "alt=" Wkiol1lo0kar-bsyaabcjmrcmbs721.png "/>2. Package* What if different people write the s

encoding method.BeautifulSoup has become as good a Python interpreter as lxml and Html6lib, providing users with the flexibility to provide different analytic strategies or strong speedsPython Regular expression re moduleThe regular expression is a small, highly specialized programming language embedded in the Python development language that can be used through the RE module,A regular expression uses a si

) #获取test2 The root sub of the. Py, and then get the sub root directory srcsys.path.insert (0, path) #将src目录添加到环境变量ImportMod1ImportMod2.mod2When the interpreter encounters an import statement, the module is imported if it is in the current search path.A search path is a list of all directories that an interpreter will search first. If you need to import module support, you need to place the command at the top of the program A module will only be imported once The

Python common modules are divided into two sections, respectively, the following modules Time Module Random module Hashlib Module OS Module SYS module Logging module Serial Number Module Configparser Module Re module Time ModuleIn Python, there are usually three ways to represent time: timestamp, t

functions similar to Java. I searched the internet, because there was no clear article on the Internet to explain how to do it. So I wrote this article. I hope that new users will not take the same detour as me because they are new users, I have not considered Exception Handling here.-Dynamic loading classWhen it comes to dynamic loading classes, we have to say that dynamic addition modules. Because the module can only be successfully added to the cl

" S_gbk=s.encode ("GBK") #编码print (s) print (S_GBK)Print ("-----GBK converted to utf-8-----")Gbk_to_utf8=s_gbk.decode ("GBK"). Encode ("Utf-8") print ("UTF8", Gbk_to_utf8)Operation Result:Hello B ' \xc4\xe3\xba\xc3 '-----GBK converted to utf-8-----UTF8 B ' \xe4\xbd\xa0\xe5\xa5\xbd '2. Example:#-*-Coding:utf-8-*-s= "study hard" #注意: At this time S is still the default Unicode form of the system, not affected by the text header coding:utf-8 S_to_gb2312=s.encode ("gb2312") #所以可以直接编码为gb2312gb2312

The most abundant and powerful class libraries in the scripting language in Python are enough to support the vast majority of daily applications. In actual program development, Python is often called the assembly language, the reason for this is that he can easily use various modules made in other languages. This article will explain in detail how to use these fu

This article mainly introduces how to load Python modules. For more information, see whether to use import or from mmmm import *. after the program runs, looking back at the mmmm storage. directory of the py file (about mmmm. the py file can be viewed in the previous lecture), with one more file: qw@qw-Latitude-E4300:~/Documents/ITArticles/BasicPython/codes$ ls mmm*mmmm.py mmmm.pycUnder this directory, the

　　This series of tutorials is intended for individual learning notes, and if you want to browse may require other programming language basics (such as C), why? Because I write rotten ah, only I can understand!! Module#1. The module allows you to logically organize your Python code snippets, analogous to the jar packages in Java.#2. Assigning the relevant code to a module will make your code a better and easier to understand.#3. The module is also

Modules PackagesModule concept: In the development of computer programs, as the program code more written, the code in a file will be more and more long, maintenance is more and more difficult. In order to write maintainable code, we grouped many functions into separate files, and many languages used this organization code, in Python a. py file is called a module.Benefits of using

(Arg1, arg2): Total = arg1 + arg2; # All in this is a local variable. Print "function local variable:", total Two. ModuleThe module is able to logically organize Python code snippets. Assigning the relevant code to a module makes the code easier to use and easier to understand.The module is also a Python object, with a random name attribute used to bind or reference.The module is a file that holds th

First, the module1. What is a module?A module is a file that contains the Python definition and declaration, and the filename is the suffix of the module name plus the. Py.2 Why do I use modules?If you quit the Python interpreter and then re-enter, then the functions or variables you defined previously will be lost, so we usually write the program to a file so th

Modules, exceptions, operating environments, MYSQLDBModule:Top-level files: As the entire file of the program portal, is responsible for calling other files in the code to implement the program flow function, called the top-level program files,Module Files 1Module Files 2In Python everything is object, so the module is also an object, which means that the module has properties and methods.All variables defi

straight.Need to take a look at it once. Finally appears a same different one of its copyright notice, enter "yes", then down is the folder to choose to install, click enter, installed in the current Folder.So it's ready for Installation.Enter under current folder>>> Ipython--pylabJust come Out.Python 2.7.3 (default, Apr 20 2012, 22:44:07)Type "copyright", "credits" or "license" for more Information.IPython 0.12.1--an Enhanced Interactive Python.? In

Module: A module is a file containing Python definitions and declarations, and the filename is the suffix of the module name plus the. Py.In fact, the import loaded module is divided into four general categories:1 code written using Python (. py file)2 C or C + + extensions that have been compiled as shared libraries or DLLs3 packages for a set of modules4 built-in modu