Python

OneIf Chinese is included:1, or in the file header add: # CODING=GBK2, the file is changed to UTF-8 no BOM format encodingTwoPython Case-sensitivePython can be nested in single and double quotes without escapingPython program requirements are best

Authoritative Source: http://www.python.org/dev/peps/pep-0263/The header declaration of the Python source file (declared on the first or second line of the file)# Coding=utf-8# Coding:utf-8#-*-Coding:utf-8-*-To conform to the regular specification

Note: The original article is Dr. Charles Severance's "Python for Informatics". The code in this article is rewritten with version 3.4 and passed in the native test.12.5 HTML parsing and Web crawlingOne of the most common features of the Urllib

Read a book see iterators and generators, the general use is not a problem, but many times it is not used to be used toThe book in the example of the classic eight Queen question, as a programmer how to let go of the opportunity to do the problem,

>>>aa= "HI" >>>num=[0,1,2,3,4,5]>>>for i in Num:if i >0:print (aa) HihihihihiThis is the implementation of "put a string, repeated occurrences of the number of elements in a list satisfies the condition", the result is a str, if you want to simplify

Features in Python attribute attribute is a variable inside an object The state of an object is described by its attributes, and the method of the object can change its properties Attributes can be accessed directly from outside the

Https://docs.python.org/3/library/re.htmlHttp://www.cnblogs.com/PythonHome/archive/2011/11/19/2255459.html1. Provide regular expression-related operations2. Pattern strings and matching strings can be Unicode or 8-bit strings, but cannot be mixed3.

Super is used to solve multiple inheritance problems, it is not a problem to call the parent class directly with the class name when using single inheritance, but if multiple inheritance is used, it involves various problems such as lookup order

Note: The following article was originally from Dr. Charles Severance's Python for informaticsMany of the examples in this book focus on reading files and finding data, but there are many different sources of information on the Internet.In this

"Python core programming" learning notesif __name__ = = ' __main__ ':One, two, threeGet keyboard input1, Raw_input (")2, Sys.stdin.readline ()Strip () Remove the 2-side space.34 is equivalent to (3Print and c are basically consistent with

This series of blog plans:1, analysis of the Python-based web framework Tornado source code2. Develop a sound MVC framework for PythonFirst will take everyone together to analyze the web framework based on Python writing tornado, in line with easy

One: argparse introduction1. ArgparseArgparse, which is the recommended tool for writing command-line programs in the Python standard libraryParser = Argparse. Argumentparser () creates an instance,#parser. Parse_args () The Parse_args method is to

Set is an unordered and non-repeating collection of elements1. Create a Collection>>> S1 = set () >>> s1.add (' a ') >>> s1{' a '}>>> s1.add (' a ') >>> s1{' a '}> >> S1 = set ([' A ', ' B ', ' C ']) >>> s1{' B ', ' A ', ' C '}2. Clear elements>>> s1

Wrote a program, mainly used to detect the MySQL database empty password and weak password,Here, three types of weak passwords are defined:1. Continuous numbers, such as 123456, are implemented in Get_weak_num2. Continuous letters, such as ABCDEF,

The "way One" percent sign (%) way, Class C of printf, needs to be different types.1, anonymous tuple. ( recommended when the parameters are low )>>> ' Name:%s, age:%d '% (' Walker ', 99) ' Name: Walker, Age: 99 '2, named Dict, the dictionary key

First, prefaceThere must be support for the basic environment before learning Python, and currently Python supports a variety of mainstream systems, with only a Python package installed, and a Linux server is needed for easier code to run later on

Simple replication is a reference a=[1,23,4]b=a #这是引用b.append(2323)print(a,b) #([1, 23, 4, 2323], [1, 23, 4, 2323]) shallow copy with Copy.copy importcopyc=copy.copy(b)#拷贝c.append(1)print(b,c)#([1, 23, 4, 2323]

Python implements file copy and deletion, A small tool is implemented using python. In fact, the configuration file under the debug directory is simply copied to the specified directory, and the generated file under the Release is copied to the same

Python implements forward query of Domain Name System (DNS), pythondns This example describes how to implement forward query of the Domain Name System (DNS) in python. We will share this with you for your reference. The details are as follows: The

Ruby uses eventmachine to add the file download function to the HTTP server, Ideas:Use ruby eventmachine and em-http-server gem to complete a simple HttpServer that provides the file download function;The FileStreamer of EM is used to send files