Python

There will be such a mistake: Commanderror:app ' books ' has migrations. Only the sqlmigrate and Sqlflush commands can is used when a app has migrations.This is because the old version and the new version command have a different problem.I'm using a

Although the mobile phone on the barcode application has been very popular, but the work is still used webcam more convenient. For example need to detect barcode, I just need to take webcam to the computer screen or paper to sweep on it. Share today

1. DigitalSeveral types are supported in Python: shaping (int), Boolean (bool), floating-point (float), complex (also called imaginary, complex) Boolean type Integer Floating point number Bool=false;print

This article discusses the use of the Python underline (_) character. We'll see that, as with many things in Python, the different uses of underscores are mostly (not all) just common practice.Single Underline (_)Typically, it is used in the

The tile function is in the Python module numpy.lib.shape_base, and his function is to repeat an array. For example, Tile (a,n), the function is to repeat the array a n times to form a new array, we still use specific examples to illustrate the

The Python built-in (built-in) function is created as the Python interpreter runs. In Python programs, you can call these functions at any time, and you don't need to define them. The most common built-in functions are:Print ("Hello world!")In the

Beginner Python collection of articles-segmentfault (next summary v2ex) http://segmentfault.com/blog/news/1190000000350824 You should know 10 Python moduleshttp://segmentfault.com/blog/news/1190000000369885 What you need to know about Python

Yesterday did more than 20 hours of hard-seat home. It is also a good place to study on a train that has poor network signals. If your phone is low on battery, it's a perfect match with two books. I read on the train more than 200 pages of content,

Summer Internship began, in order to record their monthly attendance, wrote a small program. The simple principle is that Python handles text files and dates.The main.py program code is as follows:#-*-Coding:utf-8-*-# Author: The Blue Sky

I have a large file (~4G) to the process in Python. I wonder whether it is OK to "read" such a large file. So I tried in the following several ways:The original large file to deal with was not "./centos-6.5-i386.iso", and I just take this file as a

1, self-written module, can be added directly to the path. This makes it possible to call directly.Import SysSys.path.append ("/home/username/")2. Single File moduleCopy files directly to $python_dir/lib3, the third-party library downloaded on-line,

?The first line of the source code file is added: #coding: utf-8, so you can avoidOr:#-*-coding:utf-8-*-?Dict: is actually a hash table whose keys can only be immutable types, such as string,bool,int,float.Common operations: Add, delete, modify,

Python crawler, download the Watercress Group pictures#-*-Coding:utf-8-*-#-----------------------------------------------# Program: Watercress Group Picture Crawler # version: 1.0# language: Python 3.4# GDP1 2315# operation: Input Watercress Group

Link is an important factor in SEO. In order to get a better ranking in search engines, be sure to check regularly if the links in the site are still valid. In particular, some great changes can cause bad links to occur. To detect link problems

If __name__ = = in Python'__main__': Parsing when you open a. py file, you often see the if __name__ at the bottom of the code=='__main__': Now let's introduce its role. The module is an object, and all modules have a built-in property of __name__.

Write a script to determine whether the 80 port of the machine is open, if you do not open anything, if the discovery of the port does not exist, then restart the httpd service, the concurrent mail notify you yourself. Once the script is written, it

Happy Shrimphttp://blog.csdn.net/lights_joy/Welcome reprint, but please keep the author informationTry it below python complete the operation of the wavelet correlation, which can be done by Pywavelet this library to complete. Pywavelet The main

Import loggingimport osimport timedef logger (USER_NAME):     "Log function module"     logger = logging.getlogger (USER_NAME)     logger.setlevel (Logging. DEBUG)     log_file =  '/TMP/TJ ' Now_minute = time.strftime ("%y%m%d%h%m", Time.localtime ()

Preface to the Python crawl novelThis script commands Mac to write in a crawl novel, using Python which has several yards.Code# coding=utf-8import Reimport urllib2import chardetimport sysfrom bs4 import beautifulsoupimport codecsclass Spider (): def

IntroducedThis article will show you how to write a Python script with only 200 lines and a "face change" for the characters in two portraits.This process can be divided into four steps: Detects facial markers. Rotate, scale, and