Python

Centos7 Use Pip installation Python-mysqldb problems with the module:First of all:Yum Install Python2-pip-yPip Install Mysql-pythonThe following error occurs during installation:Execute the following command or an error:Pip Install--upgrade pipYum

The use of the Python eval () functionThe eval (str) function is powerful, as the official explanation is that the string STR is evaluated as a valid expression and returns the result of the calculation. So it's good to combine math as a

A single underscore (_) is typically used in three ways: In the Python interpreter: A single underscore represents the result of the last execution in the interactive Interpretation session (console). This was first implemented in the

Original address: http://blog.csdn.net/jerry_1126/article/details/46584179In Python, it is easy to use the OS module to run other scripts or programs so that the functionality provided by other scripts or programs can be used directly in the script

Anaconda package management tools /Anaconda packages Management Tools Anaconda is the world's most popular Python data science platformAnaconda's guarantee tool allows users to set up specific environments for different projects, and the switch is

Python By default can be tab completion command line, in interactive mode, as long as you write a small tab.py module, the implementation code is as follows;#!/bin/env python # -*- coding: utf-8 -*-# python startup file

Get ready:1. Download the support environment for the Elang language http://www.erlang.org/download.html (RABBITMQ developed using it)2. Download the RABBITMQ software http://www.rabbitmq.com/releases/rabbitmq-server/(depending on your system

JSON & Pickle Before we learned to use the eval built-in method to turn a string into a Python object, the Eval method has limitations, for normal data types, Both Json.loads and Eval are available, but when a particular type is encountered, eval is

Win7 64-bit installation pcapy pack times wrong:Error:command ' "C:\Users\Administrator\AppData\Local\Programs\Common\Microsoft\Visual C + + for python\9.0\vc\bin\ Amd64\link.exe "' failed with exit status 1120After the installation process is

I. Io, synchronous IO, and asynchronous IOIo is the input/output in the computer, that is, input and output. Because the program and runtime data resides in memory and is executed by the CPU, an ultra-fast compute core, where the data is exchanged,

I think the thing that makes wheels is that anyone can do it. Just do it well or not, do it with your heart and you'll be elegant.Before using Java code generator, what pojodobodbo can be generated, so I also come to build a wheel of my own.The

Why use an adorner?Sometimes write a piece of code, over a period of time need to upgrade it, add some new features, but if you want to directly modify the original code will affect other people's call, so you need a not to modify the source code

Use Python to debug simple programs directly from the command line.WIN10 (PowerShell) Without tab completion, the operation is really troublesome.Online search learned, record, review with, hahahaEnvironment: WIN10 64-bit Python2,python3One: Install

Review of file operationsReading: read: One-time reading, ReadLines: One-time read, ReadLine: One line of reading, the disadvantage: do not know at that endVideo, image with RB belongs to bytes type, is read in bytes for loop (best)Write:

Python automated tests generate HTML test reportsHtmltestrunner is an extension of the Python standard library UnitTest unit Testing framework, which generates easy-to-use HTML test reports.Ubuntu Placement: Enter the Python3 command into Python

JSON as a medium for data interaction between different languages, has gradually replaced the previous XML in the present, looking at a wave of Python operation JSON1 #coding = ASCII2 3 ImportJSON4 ImportPickle5 ImportSYS6 ImportOS7 " "8 Practice

In the software often need to get the path of the file, there are many ways (such as Os.path.realpath (__file__), OS.GETCWD (), Os.path.abspath (__file__), sys.path[0], Sys.argv[0]), but each has a different, compared to the following:In a

3. Create a new version that uses two classes, one of which is Map and the other is the Engine. Tip: Put the play into the Engine. 、#coding =utf-8From sys import exitFrom random import RandintClass Map (object):def __init__ (self):Self.quips = ["You

TCP Client Client Programming Steps: Creating a Socket Object IP and Port,connect () methods connected to the server Transferring data Send and receive data using the Send, Recv method Close the connection

legb rule /LEGB rule LEGB variable search order ----from the Python Learning manual/ learning python Page 419----Python's variable name resolution mechanism is called the LEGB rule.L–local: local scope;E–enclosing: The local scope of def or lambda