Python

DescribeThe Python Join () method is used to generate a new string from the elements in the sequence with the specified character connection.GrammarJoin () method syntax:Str. Join(sequence) Parameters Sequence-the sequence of elements

Simple closure of chestnuts:def counter (statr_at = 0): Count = 1def incr (): nonlocal count #注意由于count类型为immutable, So it's important to declare that the external scope is referenced in this local scope that countcount + = 1return Countreturn incr>>

#Coding=utf-8classEmployee:'base class for all employees'Empcount=0def __init__(self, Name, salary): Self.name=name Self.salary=Salary Employee.empcount+ = 1defDisplaycount (self):Print("Total Employee%d"%employee.empcount)defDisplayemployee

String input:my_string = Raw_input ("pleaseinput a word:")String judgment:(1) Judgment is not pure letterMy_string.isalpha ()String Search matches:(1) ReRe-regular Expression instance one: ^[\w_]*$The first \w is to match any word character that

#coding=utf-8#python 装饰器‘‘‘    装饰器可以用def的形式来定义。装饰器接收一个可调用对象作为输入参数，并返回一个新的可调用对象。装饰器新建了一个可调用对象，也就是return 返回的函数funx，在新增的函数中，可以添加我们需要的功能，并通过调用原有函数来实现原有函数的功能‘‘‘defdeco(func):    ‘‘‘        无参数装饰器，func为被装饰的函数    ‘‘‘    def_deco():        print"执行函数之前的，执行" 

1. Python's Dictionary items (), keys (), values () all return a list>>> dict = {1:2,'a':'b','Hello':' World' } >>>dict.values () ['b', 2,' World'] >>>Dict.keys () ['a', 1,'Hello'] >>>Dict.items () [('a','b'), (1, 2), ('Hello',' World')] >>>2.

Urllib.request.urlopen (URL). read (). Decode (' Utf-8 ')Error in URL with Chinese parameter: unicodeencodeerror: ' ASCII ' codec can ' t encode characters in position 84-86:ordinal not in range (128)Need to transcode in Chineseurl =

A financial user should know this site, in the "check-in Ceremony" section, a day will have a post, with the keywords given in the message replies, the money, it is said that the copper coins can change cash, can also change books.It's good that

In Python, you can almost complete all object-oriented programming elements in C + +.Inheritance: Python supports multiple inheritance:Class Derived (Base1, Base2, BASE3):PassPolymorphic: All instance methods in Python are of type

　　1. Read the file of the specified directory2, read local files, output file contents3. Write and save a file to the specified directoryPython's code is very concise and efficient, the implementation of the above three functions only 40 lines of

The log is a very important thing for development or operation, it can be used to troubleshoot, troubleshoot, analyze, and so on.This article describes the use of log libraries in Python.Log Library: Import loggingTo use the log you need to first

Python's Hashlib module provides some common encryption featuresFor example, get the MD5 checksum value of the string ' Nobody inspects the spammish repetition 'In []: Import Hashlibin [further]: M=HASHLIB.MD5 () in [+]: m.update (' Nobody inspects '

That wall is really hateful! In the It circle, often need to use GG data (you can also use to access the 1024x768, ^_^ ... ）。 Of course, you can also use Baidu. In fact, it is not that I do not love Baidu, there is a reason, and listen to my thin

One, dependent modulePycrypto-the Python Cryptography ToolkitTwo$ wget http://www.lag.net/paramiko/download/paramiko-1.7.6.tar.gz$ wget http://ftp.dlitz.net/pub/dlitz/crypto/pycrypto/pycrypto-2.4.1.tar.gzor wget

return valueEven if the hello () function has no return statement but it still has a return value of NoneThe return value of Python can be multiple, that is, return a sequenceScope of function variablesA variable defined in a subroutine is called a

Recently there is a monitoring requirement, you need to execute the script on each node of the cluster remotely, and get the result of the script execution, in order to be safe, do not need the account password to log in the host, require only the

Solution: WindowsError: [Error 2], windowserrorerror     If a problem occurs when renaming a file using the rename () function of Python, the Error WindowsError: [Error 2] is prompted. The initial code is as follows: Def renameFile (filename):

Parse HDF files using Python Some time ago, a file in HDF format needs to be parsed due to a business requirement. Before that, I do not know what HDF files are. Baidu encyclopedia's explanation is as follows: HDF is a self-describing and

Python reads the TXT file to the array and the list is de-duplicated and then sorted in the original order, pythontxt This example describes how to sort TXT files in the original order after deduplication from the array and list. Share it with you

Python zipfile module Usage Details, pythonzipfile The zip file format is a common document compression standard. In the ziplib module, use the ZipFile class to operate the zip file. The following describes the details:Class zipfile. ZipFile (file [,