Python

# Chapter Two: list and tuple   sequence, each element has a sequence number, starting with 0, the last element ordinal is-1, the penultimate-2 sequence type includes, list, tuple, string, Unicode string, buffer, xrange list can be modified, Tuples

One, the Yuan Zu operation1 #!/usr/bin/env python2 #_*_coding:utf-8_*_3 4 #why should have tuples, store multiple values, tuples immutable, more is used to do queries5 #1. Tuples ()6 #the tuple is the same as the list, but cannot be deleted or

For all Web applications, essentially a socket server, the user's browser is actually a socket client.WSGI (Web server Gateway Interface) is a specification that defines the interface format between Web apps and Web servers written in Python,

Python recursionIf a function calls the function itself internally, the function is a recursive function;Here's a classic example: using Python recursion to find factorialdef fact (j): sum=0 if j==0: sum=1 Else: sum =j*fact (j-

Used to provide actions related to the Python interpreter: sys.argv 命令行参数List，第一个元素是程序本身路径 Sys.exit (N) 退出程序，正常退出时exit(0)　　　　 Sys.version 获取Python解释程序的版本信息 sys.maxint

Http://www.cnblogs.com/wind128/p/4409422.html1 Official website Download version HTTP://WWW.SUBLIMETEXT.COM/3Choose Windows-also available as a portable version Windows Bit-also available as a portable version Select Protable

1. Introduction to FunctionsIn short, a function is a part that sets some statements together, and it can run in a program more than once. The function can also calculate a return value and be able to change the parameters as input to the function,

1. List slices1l=['a','b','C','D','e','F']2 Print(L[1:5])#Slice according to the index number, but Gu Tou regardless of the tail3['b','C','D','e']4 Print(L[1:5:2])#according to the index number to slice, Gu Tou regardless of the tail, after adding a

Python multi-threaded synchronization queue modelMy problem is that there is a very slow processing logic (such as word segmentation, syntax), a large number of corpus, want to use multi-threaded to deal with.This process can be abstracted into a

The Python class mechanism introduces classes to languages using as little new syntax and semantics as possible. The Python class provides all the standard features of the object-oriented programming language: The class inheritance mechanism allows

Look at some problems of tutorial and solutions nine. Class 9.3.4 Method Objectclass MyClass: "" " A Simple Example Class "" "= 12345 def f (self): return ' Hello world '= X.F while True: print XF ()Reference: The special of the

1, Global matching function re.compile (pattern=pattern,re. S). FindAll (text) function:The compile function generates a regular expression object based on a pattern string and an optional flag parameter. The object has a series of methods for

files, folders in Python (file manipulation function) operation requires an OS module and a shutil module. Get the current working directory, that is, the directory path of the current Python script work: OS.GETCWD ()Returns all files and directory

FunctionL functions are well-organized, reusable code snippets for single or related functionsThe L function can improve the modularity of the application and the reuse of the code. Python provides a number of built-in functions, or you can create

Recently there is a need, with multithreading more appropriate, but I need the return value of each thread, which requires me in threading. The thread is encapsulated on the basis ofImportThreadingclassMyThread (Threading. Thread):def

Import and use of 1.numpyfrom numpy import *; #导入numpy的库函数Import NumPy as NP; #这个方式使用numpy的函数时, need to start with NP.2. Creation of matricesCreate matrices from one-dimensional or two-dimensional dataA1=array ([i])A1=mat (A1)A1=mat ([i])Create a

The Pymysql module is for MySQL 1 Import pymysql 2 3 4 5 # Create connection 6 conn = Pymysql.connect (host= ' 127.0.0.1 ', port=3306, user= ' root ', passwd= ' roo T ', db= ' test ') 7 # Create cursor 8 cursor = conn.cursor () 9 #创建一个表10 effect_

Recently I'm going to have an automated OPS platform, so I'm looking at Django's knowledge. In the actual project development, encountered a small problem: the front and back end of the data interaction is the main use of JSON. Front-end data to

Chinese text classification is not like English text classification just need to separate the words one by one, the Chinese text classification needs to be composed of words to form a vector. Therefore, participle is required. Here use the online

A cursor is a data access object that can be used to iterate a set of rows in a table or to insert new rows into a table. There are three types of cursors: search, insert, or Update. Cursors are typically used to read existing geometries and write