hitchhiker s guide to python

# #-*-Coding:utf-8-*-# # python:2.x# __author__ = ' Administrator '#命名指南#一组常用的命名规则可以被应用到变量, method functions and properties, the names of classes and modules play an important role in namespaces, so there are generally 2 modes: sleep mode and anti-pattern#使用has, the is prefix names a Boolean element, such as#当一个元素用来保存布尔值, using the Has,is prefix to name a Boolean element is a good choice.Class DB (object):Is_connected=falseHas_cache=falseHas_1=db ()Pr

Xgboost parameter Tuning Complete guide (Python code included): http://www.2cto.com/kf/201607/528771.htmlhttps://www.zhihu.com/question/41354392"The following turns to self-knowledge" https://www.zhihu.com/question/45487317 why XGBOOST/GBDT in the parameter when the depth of the tree can be very little to achieve high precision?When participating in the Kaggle, use the XGBOOST/GBDT to tune the maximum depth

One of the advantages of using the Python magic method is that it provides an easy way to make objects behave like built-in types. This means that you can avoid performing basic operations with ugly, anti-intuitive, and nonstandard methods. In some languages, this is usually done:If Instance.equals (other_instance): # do somethingYou should also do this in Python, but at the same time it will increase th

Python BeautifulSoup4 User Guide, beautifulsoup Preface: Yesterday, the legendary BeautifulSoup4 was installed, and no children's shoes have been installed. Please refer to my previous blog: Install BeautifulSoup in Python3 Win7You can install BeautifulSoup following the simple steps in it. It is very simple, and the table is afraid. After installing BeautifulSoup4, let's enjoy this bowl of BeautifulSoup.

The descriptor in Python is a simple user guide, which is pythondescriptor. When defining the iterator, the description is the object that implements the iteration protocol, that is, the object that implements the _ iter _ method. Similarly, the descriptor implements the descriptor Protocol, namely, the object of the _ get __, _ set __, and _ delete _ methods. The definition is abstract. Talk is cheap. Chec

download the source code recompile, address: https://github.com/open-source-parsers/jsoncpp.git3. Execute make on the Access client directoryPlease note that makefile should be modified according to the FASTDFS installation directory.Iv. Introduction of the interface1, fdfs_init (parameter 1st log level) Initialize FASTDFS clientParameter 1: String FASTDFS Client Profile directory, for example: "/etc/fdfs/client.conf"Parameter 2: Shaping print Log level total seven levelsLog_emerg = 0log_alert

following: Basic Mathematics, Resource 1: "Mathematics | Khan Academy "(in particular calculus, probability theory and linear algebra) Python Basics, resources: "Getting Started with computer science", edx course Statistical basis, Resources: "Introduction to Statistics", Udacity's curriculum Machine learning Basics, resources: "Getting Started with machine learning", Udacity's Course Time: 2-6 months recommended Step 1: Set up your machine. Before p

pybundles (archives containing multiple packages) Freeze:output all currently instal LED packages (exact versions) to stdout Help:show available commandsInstall: Install packages search:search PyPI Uninstall:uninstall packagesUnzip: Unzip Individual PackagesZip: Zip Individual PackagesView Code2. Install with get-pip.py:wget https://bootstrap.pypa.io/get-pip.pysudo python get-pip.py ...3. Upgradesudo Install -Install -u pipUse1. Install the package:I

Module (modules)To meet the convenience of the maintenance program, Python provides a way to get the definition from a file, and the module refers to a file that includes Python definitions and declarations, whose file name is the module name +.py suffix, and the module name of the module can be __name__ by the global variable.The file structure is created as follows, where modu.py is the called module, Tra

can use Fig.suptitle () to set the overall caption of the entire graph. 7. Line style and line widthChange the line width, color, or style.8. Basic Data distributionThe necessary operations in the EDA process.9. Contour and color grid for two-D arraysThermal image (color grid) and contour plots help visualize 2D data in many cases.10. Image adjustment, modification of edge coordinates and scaleFinally, adjust the details to make the drawing look better.11. Scale limits and automatic adjust

Tag: Returns the beginning of the pattern span pre number expression test PythonThis article mainly explains the use of template in Python and the use of skills, very practical, the need for friends can refer to the following:Template is undoubtedly a good thing, can be the format of the string to be fixed, re-use. The template can also allow developers to consider the format of the string and its contents, virtually reducing the pressure on developer

()4 5Ax = Fig.add_subplot (211)6Ax.fill_between (x,y,y1,facecolor='b')7 Ax.grid (True)8 9AX2 = Fig.add_subplot (212)TenAx2.fill (x,y,facecolor='b', alpha=0.3) OneAx2.fill (x,y1,facecolor='g', alpha=0.3) A Ax2.grid (True) -# plt.show ()1 " "three-dimensional drawing" "2 3 From Mpl_toolkits.mplot3d import axes3d4 5U = Np.linspace (-1,1, -)6X, y =Np.meshgrid (u,u) # Grid coordinate generation function7z = x**2+y**28 9Fig =plt.figure ()TenAx =axes3d (Fig) One# cmap =Color_map, the other two paramet

Guide for installing and using Fabric, an automated deployment module of Python, pythonfabric Fabric is a python2.5 or higher library. You can execute tasks in batches on multiple hosts through ssh. complete system management tasks. it provides a set of basic operations to execute shell commands locally and remotely, or upload and download files to help users input or terminate execution. The following two

Exit the current environment: 1 Source Deactivate Also note that in Windows systems, use activate env_name and deactivate to enter and exit an environment.To remove an environment named Env_name: 1 Conda Env Remove - n env_name Show All environments: 1 Conda Env List When sharing the code, but also need to share the environment to everyone, execute the following command can

The high-speed landing practice of Python Coding style guide Machine and human strengths, such as coding style Check this can be self-active work should be handed over to the machine, so this article helps you in a few minutes to achieve the coding style of self-active inspection. 1. What are the famous Python Coding Style

enhanced operator +=,-=,*=,/=; an additional stripping operator//,eg.1 >>> 5 + 2 2 7 3 >>> 5-2 4 3 5 >>>a = 3 6# 7 8 >>> b = 24#4 > >> 7/2 3.5 >>> 7/2 3Arithmetic OperatorsIf you divide a decimal number, you can use the Peel operator if you need to produce an integer value1>>> name ="Jack"2>>> name +"Joe" #represents a connection of two strings, but does not change the original string3 'Jackjoe'4>>>name5 'Jack'6>>> name + ="Doe" #extending the string will change the original string7

The generator is an iterator, and it is not just an iterator. However, there are not many uses outside the iterator, so we can say it out loud: the generator provides a convenient way to customize the iterator. This is the last article in the functional programming guide. It seems that it took a week to write it well ...... For reprint, please specify the original author and original address :) 4. Generator 4.1. Introduction to Generator First, be s

Code Editor or IDERecommended vs Code,atom and sublime (this article with vs Code for example, sublime to Chinese support is not very good, often fix the sublime garbled, but when copied to other editors, there is a problem)VS Code Official Website: vs CodeVS Code Shortcuts Official document: vs Code shortcut ManualPython version and installation issuespython3.x There are some incompatible python2.x places, we recommend the latest version, official website: PythonInstallation

Anaconda multi-Environment multi-version python Configuration Guide, anacondapythonAnaconda multi-Environment multi-version python Configuration Guide From: http://www.jianshu.com/p/d2e15200ee9b Address: http://conda.pydata.org/docs/test-drive.htmlConda test Guide Before sta

This article mainly introduces the Python function Programming Guide (3): Iterator details. This article describes the Iterator overview, the use of Iterator, generator expression (Generatorexpression) and ListComprehension. For more information, see 3. iterator 3.1. Iterator overview An iterator is a way to access elements in a set. The iterator object is accessed from the first element of the set until a