Discover python coding book, include the articles, news, trends, analysis and practical advice about python coding book on alibabacloud.com
PEP8 Python Coding SpecificationA code orchestration1 indent. Indentation of 4 spaces (the editor can do this), no tap, no mix of taps and spaces.2 The maximum length per line is 79, the line break can use backslashes, preferably with parentheses. The newline point is to hit enter after the operator.There are two empty lines between the 3 class and the top-level function definition, an empty line between th
actually none, and in Ubuntu Normal command line this variable is UTF-8.So how do you change sys.stdout.encoding? (Direct modification will be error typeerror:readonly attribute)So I finally found http://www.macfreek.nl/memory/Encoding_of_Python_stdout.Python2 Modification Method (Python3 slightly different, also written in the original)1 ifSys.stdout.encoding! ='UTF-8':2Sys.stdout = Codecs.getwriter ('Utf-8') (Sys.stdout,'Strict')3 ifSys.stderr.encoding! ='UTF-8':4Sys.stderr = Codecs.getwriter
Coding the matrix: Linear Algebra Through Computer Science Applications This is a course for implementing matrix operations using python. For the first assignment, I felt that python was greatly improved and various data types were used.The Code is as follows: ## Task 1minutes_in_week = 60*24*7## Task 2remainder_without_mod = 2304811-2304811//47*47## Task 3divis
small as possible to prevent other errors from being masked out EXAMPLE:# Yestry: value = collection[key]except KeyError: return key_not_found(key)else: return handle_value(value)# Notry: return handle_value(collection[key])except KeyError: # 可能会捕捉到 handle_value()中的 KeyError, 而不是 collection 的 return key_not_found(key) The function or method should explicitly return none when there is no return value # Yesdef foo(): return None# Nodef foo(): return Use a string
1. The default encoding of the string in the code is consistent with the encoding of the code file itself.such as: str = ' Chinese 'If it is in a UTF8 file, the string is UTF8 encoded, and if it is in a gb2312 file, it is encoded as gb2312.#_ *_encoding:gbk_*_str = ' Hello 'Str.decode (' GBK ')Str.encode (' Unicode ')2. Python uses Unicode encoding internally. Unicode is used as an intermediate encoding in which other encoded strings are decoded (deco
Python security coding and code Auditing 1 PrefaceCurrently, the general web development framework security has been quite good. For example, django is commonly used, but some nonstandard development methods will still cause some common security problems, the following is a summary of these common problems. For the preparation of code audit, see php code audit. This document mainly describes common error sc
containers: Namedtuple () # factory function, used to create a subclass of tuples with named Fields Deque # A list-like container that allows arbitrary terminals to quickly append and retrieve Counter # dict subclass for counting hash objects OrderedDict # dict subclass, used to store the added command records Defaultdict # dict subclass, used to call factory functions to supplement Missing Values 7. magic method of creating classes in Python
internal encoding of characters in Python. Cp936 is not used in Linux. This is explained on my blog: http://www.donews.net/limodou/archive/2004/08/13/67432.aspx Therefore, we need to use a GBK encoding module or a CJK module. ======================================Code: # Coding: UTF-8# Specify the file encoding as utf8Import OS# The following is the sample code, which may not be able to run. It ca
"Ask a question", when writing Python, when you run a script with Chinese output or comments, you will be prompted with an error message:Syntaxerror:non-ascii character ' \xe5 ' in file *******----------------------------------------------------------------------------------------------------------"Analyzing Problems",----------------------------------------------------------------------------------------------------------Python's default encoding fil
script process in Apache have no locale environment Settings-they is not part of the CGI specification; Therefore the Sys.stdout encoding defaults to ansi_x3.4-1968-in other words, ASCII; If you try to print () A string this contain non-ascii characters to sys.stdout you'll get "unicodeencodeerror: ' ASCII ' cod EC can ' t encode character ...: Ordinal not in range (128) " A simple solution are to pass the Apache process's LANG environment variable through to the CGI script using Apache ' s m
, such as the dumps function of Simplejson, with a parameter enable_ascii (whether ASCII code is decode, encode)By default, we uniformly specify the encoding in the header of the Py file, as follows:#-*-Coding:utf-8-*-Then sometimes, (for example, in the Windows Platform Chinese environment), the resulting encoding if not utf-8 encoding, this time with Python processing string, first it will use Utf-8 to decode, if the string is not Unicode code, then
These two days, I am entangled in a piece of code. After a thorough solution, I will sort out the problems I encountered earlier, clarify my thoughts, and discover any errors on the Internet. 1. Source Code Level REF: PEP 0263 -- Defining Python Source Code EncodingsPython will default to ASCII as standard encoding if no otherEncoding hints are given. To define a source code encoding, a magic comment mustBe placed into the source files either as fi
A part of the understanding of Python character encoding was compiled, this time primarily designed to database operations. Here are some of the concepts and principles of coding, sorted by entry: CREATE DATABASE IF not EXISTS db_name DEFAULT CHARSET UTF8 COLLATE utf8_general_ci; The default charset is to set the set of defaults, that is, the data is encoded in the library from the store,
In programming languages, there are basically three ways to encodeAsciiUTF-8UnicodeThere are local coding methods, such as China's GBK, etc.where ASCII encoding is an early encoding method, where each character or English letter occupies one byte (8bit) leaving part of the space as an extension to use,650) this.width=650; "Src=" Http://s3.51cto.com/wyfs02/M02/8C/1E/wKiom1hiXzWxLsT4AAXk5OCcZfA064.png-wh_500x0-wm_3 -wmp_4-s_3214994685.png "title=" qq pi
is used in binary notation, strings will be garbled, so use bytes.What is the problem of garbled characters?Default encoding in ApythonB.python Source file EncodingC. Encoding used by the terminalD. Language settings for the operating system2. File operationThe operation of the file has a considerable amount of weight in Python, and today we look at some simple file operations in Python from a new perspect
Today, the technical school for everyone to prepare 5 of the book, in addition to books small compilation also organized 3 commonly used resources website share to everyone.1.Python Basic TutorialsThe basic Python tutorial is a classic Python primer book, with a distinct lev
1.UnicodeDecodeError: ' ASCII ' codec can ' t decode byte 0xe4 in position 0:ordinal not in range (128)Solution:Import SysReload (SYS)Sys.setdefaultencoding (' utf-8 ')2.unicodeencodeerror: ' latin-1 ' codec can ' t encode characters in position 9-13:ordinal not in rangeSolution:Add the following arrows to the indicated sentence, which is the blue code behind the figureaccount = Accountraw.encode ("Utf-8"). Decode ("Latin1")3.python2.7 query or Insert Chinese data in MySQL when there is a Chines
1. ' ASCII ' codec can ' t encode characters in position 6-7: Ordinal not in range (128)The cause of this problem is essentially ASCII encoding, in which Python naturally calls the ASCII codec to process the character stream, and throws an exception if the character stream does not fall within the ASCII range (ordinal not in range (128)).Reference: http://wangye.org/blog/archives/629/Solution:Import SysReload (SYS)Sys.setdefaultencoding (' utf-8 ')2.
First, naming rules1. Variable names, package names, module names are usually lowercase, or you can use underscores2. The class name is capitalized and the object name is lowercase. Private variable of class, private method prefixed with two underscoreExample: Class Student: #类名Student = Student ("ddd") #对象3. Function names are usually lowercaseExample: Def comparenum (NUM1,NUM2)Two, code indentation and colonCode indentation means the hierarchical relationship between each line of code by enter
Coded thinking Map:That is, the file is not encoded, in fact, in the binary format is saved in the hard disk. However, it is necessary to use the appropriate encoding to process the write read so that the operating system fits the relevant software/font and is drawn to the screen for viewing. So the key question is to know what encoding was used to compile the string data originally! However, before Unicode is used in the form of similar comparison tables to organize the encoding, can not be uni
Start building with 50+ products and up to 12 months usage for Elastic Compute Service
1 on 1 presale consultation
24/7 Technical Support 6 Free Tickets per Quarter Faster Response
Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.
A comprehensive suite of global cloud computing services to power your business
Payment Methods We Support
