python docstring example

program state (formally speaking is the issue of resource competition). To solve this problem, you need to use mutexes or other similar synchronization primitives to identify and protect key parts of your program. For example, if multiple different threads are trying to write data to the same file at the same time, you need a mutex to execute the writes sequentially, and when a thread is writing, the other thread must wait until the current thread re

Introduction of SQLAlchemySQLAlchemy is an Open-source SQL Toolkit, an object-relational mapper published by the MIT license for the basic Python programming language. SQLAlchemy provides "a well-known enterprise-class suite of persistence patterns, one of the advantages of using independent sqlalchemy such as ORM is that it allows developers to first consider the data model and decide how to visualize the data later."second, the installation of Sqlal

Example of reading and writing files and storage in Python Programming, 1. File writing and reading #! /Usr/bin/python #-*-coding: UTF-8-*-# Filename: using_file.py # The file is created and read by s = '''. We are both wood leaders, you are not allowed to speak! ''' # Create a file and write the character f = file('test_file.txt ', 'w') f. write (s) f. close ()

This article mainly introduces the Python multi-process programming technology, including the concepts of threads, queues, synchronization, and other related skills, if you need it, you can refer to this article to analyze the Python multi-process programming technology in the form of an example, which will help you further develop the

This example describes the use of mysqldb under Python. Share to everyone for your reference. The specific analysis is as follows: Download Installation MySQLdb ①linux version http://sourceforge.net/projects/mysql-python/download, the installation is to be installed first Setuptools, then in the download file directory, modify Mysite.cfg, Specifies the path to

Presumably everyone is just touching the language of Python, today this article will help you to understand python loop nestingThis knowledge point. Specifically, we introduce two loops, the for loop and the while loop, and the Python language allows you to embed another loop inside a loop body. In this article I will explain some of the

The shutil module provides more powerful local file operations than the OS module, including file compression and decompression. The following is an example of common file operation functions of the shutil module in Python: the OS module allows you to create, delete, and view file attributes for directories or files, as well as perform path operations on files and directories. For

This article mainly introduces the usage of the super keyword in Python. The example analyzes the function and related usage skills of the super keyword. If you need it, refer to the example in this article to describe the usage of the super keyword in Python. Share it with you for your reference. The specific analysis

Label:Usage Environment: Windows+python3.4+mysql5.5+navicat First, create a connection 1. Prepare to use Python to operate MySQL, first need to install Mysql-python package, under Python 3.x, the package has been renamed to Mysqlclient. You can install it by using the Pip method: Pip Install Mysqlclient or download the package file and install it. 2.

This article mainly describes Python in the use of the For loop in the process of shredding, the need for friends can refer to the following Why challenge yourself not to write a for loop in your code? Because it can force you to use more advanced, authentic syntax or libraries. In this article, we take Python as an example, and say a lot of people have actually

item in the example at the beginning of the article. Using + = to operate on t is actually to operate on a, while + = is an in-situ operation, so when t is changed, a also changes; if you use + to operate on t, when the result is assigned to t, t no longer points to a, but to [0] * 6 + t, so a is not changed. Summary The above is all the content of this article. here we are only discussing a simple question, but I have used such a long space to talk

Members, but you can even delete Data Memebers in Python Class using the del method. When I first saw this feature, I was taken aback. After all, the first option of OO is encapsulation. But does this destroy the encapsulation feature? Fourth, because Python supports multi-inheritance, method ambiguity may occur. However, because Python follows the deep-first se

= "http:/ Www.baidu.com "Data=use_proxy (proxy_addr,url) fl=open ("/home/urllib/test/6.html "," WB ") fl.write (data) fl.close ()Open DebuglogImport urllib.requesturl= "http://www.baidu.com" Httpd=urllib.request.httphandler (debuglevel=1) httpsd= Urllib.request.HTTPSHandler (debuglevel=1) Opener=urllib.request.build_opener (opener) Urllib.request.install_ Opener (opener) Data=urllib.request.urlopen (URL) fl=open ("/home/urllib/test/7.html", "WB") fl.write (data) fl.close ()Urlerror Exception Han

, it can discard a task (perhaps this particular page has just been crawled), or assign a different priority to the task. When the priority of each task is determined, they are passed in to the crawler. It crawls the page again. The process is complex, but logically simpler. When the resources on the network are crawled down, the content handler is responsible for extracting the useful information. It runs a user-written Python script that is not qu

This article mainly introduces the usage of python dynamic and strong types, and compares the usage of python dynamic and strong types with the C # instance. For more information, see the examples in this article to analyze the usage of python dynamic and strong types. Share it with you for your reference. The details are as follows:

Implementation of accessing the mysql database using python (Example 2), pythonmysql This article describes how to access the mysql database using python. We will share this with you for your reference. The details are as follows: First install MySQLdb that matches the Python version

Enumeration Don't do this: i = 0For item in Iterable:Print I, itemi + 1 But this: For I, item in enumerate (iterable):Print I, item Enumerate can accept a second parameter, for example: >>> List (Enumerate (' abc '))[(0, ' a '), (1, ' B '), (2, ' C ')]>>> List (Enumerate (' abc ', 1))[(1, ' a '), (2, ' B '), (3, ' C ')] Dictionary/Set parsing You may know list parsing, but don't know dictionary/set parsing. Dictionary/Set parsing is simple and

https://www.pythonprogramming.net/flat-clustering-machine-learning-python-scikit-learn/Unsupervised machine Learning:flat Clusteringk-means Clusternig example with Python and Scikit-learnThis series was concerning "unsupervised machine learning." The difference between supervised and unsupervised machine learning was whether or not we, the scientist, is providing

This article mainly introduces a concise example of multi-threaded programming in Python. due to the existence of GIL, multi-threaded programming in Python is a hot and difficult issue. For more information, see SummaryMultithreading is an important aspect in programming, especially in the Deamon program of the server. Regardless of the system, the thread schedul

This example describes the Super keyword usage in python. Share to everyone for your reference. The specific analysis is as follows: In the Python class method, you call a method of the parent class, which, before Python 2.2, is typically written like code Snippet 1: Code Snippet 1: ? 1 2 3 4, 5 6 7 8 9