Python

The most common in SQL injection is string stitching, and developers should pay attention to string concatenation, should not be ignored.Error usage 1:sql = "SELECT ID, name from test where id=%d and Name= '%s '"% (ID, name)Cursor.execute (SQL)Error

The general form of a class creates a class we typically use the class keyword to create a class, followed by a class name, can be customized, and finally end with a colon, as follows: Class ClassName: "Class of Description '" Class content can

1, please use the code to achieve: the use of an underscore each element of the list is stitched into a string, Li = [' Alex ', ' Eric ', ' Rain ']#!/usr/bin/env python#-*-Coding:utf-8-*-Li = [' Alex ', ' Eric ', ' Rain ']v = ' _ '. Join (LI)Print

From the blog: Shanghai-leisurelyOriginal address: http://www.cnblogs.com/yoyoketang/tag/js/ObjectiveCalendar control is a Web site often encounter a scene, some input boxes can be directly entered the date, some cannot, with our frequent ticket to

Thanks to the guidance of our predecessors, here is my own understanding, some pictures and passages from http://www.cnblogs.com/alex3714/articles/5876749.htmlHttp://www.cnblogs.com/Anker/p/3254269.htmlIf you encounter problems during your learning

1. Can iterate:When we printPrint (dir ([up])) can be seen in the results that appear with' __iter__ ', this method, #次协议叫做可迭代协议A function that contains the ' __iter__ ' method is an iterative functionstrings, lists, tuples, dictionaries, and

FunctionThrough a function, you can define a block of code, which can then be called repeatedly by the function nameDefine a function:DEF alert (): "Print Hello World" print ("Hello World")Using DEF to define a function, the second line suggests a

The learning of Python crawlers,python crawler source for automatic crawling of 163 news, this is a Python language written in the automatic crawling NetEase News Python crawler implementation of the article.The Python crawler's approach is:(1)

Hashlib Module I. Hashlib moduleFor cryptographic related operations, the 3.x force replaces the MD5 module and the SHA module, providing: SHA1,SHA224,SHA256,SHA384,SHA512,MD5 algorithm.1. Use the Hashlib module for MD5 encryption.Import=

1. R to open a read-only file, the file must exist.2. r+ open a writable file, the file must exist.3, W open only write files, if the file exists, the file length is clear to 0, that is, the contents of the file will disappear. If the file does not

Reference: Http://api.mongodb.com/python/current/faq.html#using-pymongo-with-multiprocessingIf you are using multiple processes, you must create a MONGO connection in the child process . Cannot create a MONGO connection to pass to multiple processes!

Higher order function: a function that passes a function as a parameter, such asdef Add (x,y,f): return f (x) + f (y)print(Add ( -8,11,abs))Operation Result:19Note:1. Call the Add function to perform ABS (-8) and ABC (11) respectively, and

1. Variables, types, operations, outputs, etc. #-*-coding:utf-8-*-a=2b=3C=a+bprint u'The result is =%i .'%C #加u显示中文str=unicode (s),"Utf-8") #转s为中文print str#int type and string type cannot be directly connected # Convert string concatenate and

1. ToolsMatplotlibNumPy2.matplotlib useImport Matplotlib.pyplot as Plt #plt用于显示图片Import Matplotlib.image as Mping #mping用于读取图片Import datetime as DTImport Matplotlib.dates as MdatesFrom Pylab Import *def draw_trend_chart (dates,y):mpl.rcparams[' font.

There are fan messages. I want to make a more basic, I put the copy of the previous platform down, can be a cursory look at, then will slowly out. 1. What is a reptile?Crawler, that is, web crawler, we can be understood as crawling on the internet

1. Summary of the usage of re regular(1), ^ indicates which character to start with eg: ' ^g ' denotes a string starting with G. means that any character ' ^g.d ' represents a second character starting with G, and a third string of B indicates that

Reptile Chapters1.python How to access the InternetURL(web address)+lib="urllib2. Check Documentation: Python document.3.response = Urllib.request.urlopen ("" www.baidu.com)HTML =html.decode ("Utf-8") to break binary decoding operations4. read Web

Functions are the first class of objects: they can be used as data to pass1. Can be referenced2. Can be used as a function parameter3. Can return a value as a function4. Elements that can be used as container typesSmall example:deffunc1

The computer is composed of software, system and hardware.Applications written in Python or other languages if you want to keep the data permanently, you need to write the data to the hard disk, which involves the application operating hardware, it

For the following implementation of the Make_averager () function mentioned in the previous "Python closure" essay, we keep the historical values in the list, each of which requires a re-summation of the average value, which takes up more space and