Python

Ext.: http://www.jb51.net/article/87479.htmThis article mainly introduces the reflection in Python, and the simple application of this mechanism, familiar with Java programmer, must often deal with class.forname. In many frameworks (the

1\IF statement: If condition is true, executes the IF clause statement and skips the subsequent elif or else statements; The 2\while statement, as long as the while condition is true, executes the WHILE clause statement, and then looks back at the

In the process of learning web crawler, it is necessary to crawl the number of comments on the Web page, involving regular expressions, and then look at the way. Regular expressions are a common tool in word processing.1 common strings for regular

The time has come so fast. It feels like the 15 year-end summary has just been written and 16 is over. Read blog,16 years wrote the Poor 8, for me, 16 is a smooth wind.What might unexpectedly be the end of the year I left the 2.5 Dragon chart game,

From PIL import imageimport osimport os.pathrootdir = R ' d:\ user directory \ My picture \from yun\ background map \ Background ' # indicates the folder being traversed for parent, dirname S, filenames in Os.walk (RootDir): to filename in

First, the module1. What is a module?A module is a file that contains the Python definition and declaration, and the filename is the suffix of the module name plus the. Py.2. Why should I use the module?If you quit the Python interpreter and then re-

1. Scenario Description: Host A Host B Host C 10.13.170.76 172.28.117.156 (squid) 10.95.113.131 Host a----> Host B (---> Host c), a 80 access host via B C1312.Python

1) Forget theIf, elif, else, for, while, class, def declarations are added at the end: (Causes"Syntaxerror:invalid Syntax")The error will occur in code similar to the following:The code is as follows:If spam= = 42Print (' hello! ')2) Use =rather

Python can find extra whitespace at the beginning and end of a string.To ensure that there is no whitespace at the end of the string, use Method Rstrip ().You can also reject whitespace at the beginning of a string, or both ends of a string.To do

Objective: To learn the magic methods of class in python to improve the efficiency of programming.Environment: Ubuntu 16.4 python 3.5.2Learning class is bound to come into contact with its magic methods, such as commonly used __init__, the form is

ListSliceBrackets, comma-delimited, multiple elements can be removed at once, starting position includes, end position not included (Gu Tou regardless of tail)If you take the last one and don't know the length of the list, you can use a negative

1. What is character encodingBecause the computer is also energized, we learned in junior high school physics circuit, computer design is also used in circuit design, similar to the lamp switch, only power on or off, that is, 0 is not through, 1

Because of business requirements, you need to extract each line of text with the check typeface.The sample is as follows:1 input 10kVB, c female segment 820 latching prepared self-cast platen 2 exit 10kVB, c female segment 820 standby jump 803

Most layers in Caffe are written in C + +. But for the input of their own data to write the corresponding input layer, such as you want to go to the part of the image, you can not use Lmdb, or your label needs a special tag. This is the time to

Before we formally start web development, we need to write a web framework.aiohttpis already a web framework, why do we need to encapsulate one yourself?The reason is that, from the consumer's point of view, it aiohttp takes a few steps to write a

String STR and UnicodeSTR byte streamUnicode character stream (Chinese, English, etc.) how do I convert to 01 code in a computer?Encoded ASCII, iso88591, UTF8 (after Unicode compression), Unicode (one character encoded in four bytes), UTF32, gb2312,

From lxml import etreedoubanhtml = ""Doc = etree.fromstring (doubanhtml)For Eachbook in Doc.xpath ('//dl/dd '): BookName = Eachbook.xpath (' a/text () ') [0] Bookurl = Eachbook.xpath (' a @href ') [0] Pub = Eachbook.xpath (' Div[@class =

Simple python django framework development example, pythondjango Create the views. py file in the/home/ubuntu/mysite directory as follows: 　　 from django.http import HttpResponse,Http404import datetimeimport osdef sayhi(request): return

Day7 object-oriented -- Reflection, day7 object-oriented -- Reflection You can use the following four methods to map strings or modify the status, attributes, and methods when running a program: 1. getattr (object, name [, default])-> value Get a

Binary operation (1)-Bytes, binary operation-bytes 1. The Bytes unit is processed as a string. For example: Some presentations claim that the above procedures will produce the following results:B '\ x00 \ x00 \ x00 \ x00' This result is not