Python

1. Thread LockIf you do not control the access of multiple threads to the same resource, the data is corrupted, making the results of the thread run unpredictable. So we have to introduce the thread lock.Thread synchronization ensures that multiple

Comparison operatorsComparison operators can use a comparison of two values, and all built-in types support comparison operations. When you compare two values with an operator, the result is a logical value, not true, or false.One thing to note is

Python's language style is very nice, but this language is not very friendly to Windows, because if it is a beginner installed in the Windows environment, it is torture, will encounter a variety of egg pain situation. This article wants to provide a

1 #coding = Utf-82 3 " "4 python 3.45 a simple TCP port connection is given to determine whether the specified IP is open for the specified port. 6 " "7 8 ImportSocket9 ImportOptparseTen ImportRe One ImportThreading A ImportSYS - - defAnlyze_host

Variable =open ("file to open", open mode)There are three ways to open, read, write, execute, default open mode for reading, if written, if the file exists, then empty all content, if not, create a new file, such asf = open ("/bin/ls")//quotation

1, for list lists, a. Using custom functions for statistical techniquesdef get_count (Sequence): counts={} for in sequence: if in sequence: +=1 Else: =1 return countsOr use the Python standard library

Hope to continue to update through the blog park, share and record the basic knowledge of Python to the advanced application of the dots drop!Eighth wave: Chapter 4th Dictionary: When indexing is not good　　You will learn a data structure that refers

error and Exception ConceptsError: 1. Syntax error: The code does not conform to the interpreter or compiler Syntax 2. Logic error: Incomplete or illegal input or the calculation of a problem exception: during the execution of the body caused the

The most convenient reference book for learning Python is official documentation. The Windows installation file contains an official packaged document in CHM format, which is very complete. Beginner's words, the tutorial browse again, and then

If statementComputers can do a lot of automated tasks, because it can make their own conditions to judge.For example, to enter user age, print different content according to age, in a Python program, you can use the if statement:Age = 20if Age >=:

Recently just learned this piece, if has the wrong place also invites everybody magnanimous.The python package used in this article:Ipython, Numpy, Pandas, matplotlibAncient capital's autumn original reference:

With the Hashlib module, you can verify file MD5 conformance encryption:#python detection file MD5 value #python version 2.6 import hashlibimport os,sys #简单的测试一个字符串的MD5值def GetStrMd5 (src): m0=hashlib.md5 () M0.update (src) print m0.hexdigest

In general, a descriptor is an object property with a "binding behavior" (object attribute), and its access control is overridden by the descriptor protocol method. These methods are __get__ (), __set__ (), and __delete__ (). Objects with these

The following are some of the matching usages of Python regular expressions: In addition, all http://deerchao.net/tutorials/regex/regex.htm about the regular 1. Test whether the regular expression matches all or part of the string Regex=ur ""

I. Throwing an exception Python uses an Exception object (Exception object) to represent an exception, and an exception is thrown when an error is encountered. If the exception object is not handled or captured, the program terminates execution

Python module, python module download 1. module definition As the program code is written more and more, the code in a file will grow and become increasingly difficult to maintain. In order to write maintainable code, we divide many function groups

Python Dictionary (dict) Key and value sorting, pythondict The characteristics of the python Dictionary (dict) are unordered. The corresponding values are extracted by key. If we need to sort the dictionary by value, you can use the following

Python magic method-single-eye and General Arithmetic Operations, python magic In the comparison of magic methods, we have discussed that magic methods actually overload operators, such as >,1. Single Object operator or single object operation

Detailed description of the from .. import absolute import Statement in Python, pythonfrom .. import Relative or absolute importMore complex parts have been implemented since python2.5: to import a module, you can specify absolute or

Parse socket communication with Python SimpleHTTPServer source code. simplesocketserver What is socketComputers, as the name implies, are used for computing. Therefore, the input and output are also required. The input must be calculated and the