Python's Gil and multithreaded performance in-depth analysis

What's Gil? The first thing to be clear is that Gil is not a Python feature, it is a concept introduced when implementing the Python parser (CPython). Just like C + + is a set of language (syntax) standards, but can be compiled into executable code

Python for nginx log analysis (analysis of an exception to flush an API interface IP)

Found that there is a large number of IP to our API collection, so write this script to get which IP only access to a single interface, but not access to other interfaces, generally such behavior, is abnormal.The log format of the front-end load

Python Regular Expressions Match Chinese

If you need to know how to match Chinese characters in Python, we must first look at the following table UTF8[x01-x7f]| [XC0-XDF] [x80-xbf]| [Xe0-xef] [X80-XBF] {2}| [Xf0-xff] [X80-XBF] {3}UTF16[X00-xd7] [xe0-xff]| [XD8-XDF] [X00-xff]

Count the number of duplicate rows in a text in Python

For example, there is a file below 2312 We are looking forward to 2,23,11,1The way to solve the problem:The occurrence of the text as a key, the number of occurrences as value, and then excluded by value after output It is best to output from

Introduction to Python matching regular expressions in Chinese

A small program is being written Miniblogs updater, you need to calculate the number of words entered by the user. Because the length of the Chinese-English character encoding is different, if you use the Len () function in Python, it calculates the

An introduction to operators and expressions in Python

1. Operator and its usage operator name Description Example + Add Add two objects 3 + 5 gets 8. ' A ' + ' B ' gets ' ab '. - Reducing Get negative numbers or a number minus another

Python If Else statement usage

Format of an If statementThe statement block must have the same indentation.Statement block must be indented more than if,elif,else # If conditions are true, EXECUTE statement block 1,# Otherwise, if condition 2 is established, EXECUTE statement

Python's Chinese Problem solving method

Python's Chinese Problem solving method Python's eclips tutorial environment has written a test program. As a result, this error occurs: Syntaxerror:non-ascii character ' xbd ' in file e:workspacemakeupdatafilesindexsrcmakeindex.py on line, but no

How to use the Python join character join function

String module, so it requires two parameters, one is a list, and the other is a separator. And when called, as Cnxo shows, if you import a string module: Import stringYou need to use String.Join () for this. But now the string object itself has

How to use the Python list loop statement

One of the powerful features of Python is its parsing of the list, which provides a compact way to map a list to another list by applying a function to each element in the list. Instance A = [' Cat ', ' window ', ' defenestrate ']For X in

A tutorial on the use of logging log modules in Python in a multi-process environment

Objective It is believed that every programmer should know that when using Python to write background tasks, it is often necessary to use an output log to record the state of the program running, and to save the details of the error in case of an

Encode and decode of Python string--solving garbled problem

Encode of ~python string and decode research experience--solve garbled problem Why Python use the process will appear a variety of garbled problems, obviously the Chinese characters are displayed as "/xe4/xb8/xad/xe6/x96/x87" form? Why is the error "

Python commands module replaced by subprocess in python3.x

SubprocessThe relevant modules and functions that can execute shell commands are:Os.systemOs.spawnOs.popen --wastepopen2.*--Wastecommands.*-Discarded, removed in 3.ximport commandsresult = commands.getoutput(‘cmd‘)   #Returns only the result of

Python implements full backup and differential backup of files in detail

Python implements full backup and differential backup of files Previously there was write using MD5 method to do differential backup, but this MD5 way to write the following problems: Md5sum get a problem with MD5 value for some soft

Python uses Nagios to increase the functionality of WeChat alarm notifications

Nagios is an open source, free network monitoring tool that effectively monitors Windows, Linux and UNIX host status, network settings such as switch routers, printers, and more. Send mail or SMS alarm when the system or service status is abnormal

Python crawlers use cookies to simulate login instances.

Python crawlers use cookies to simulate login instances. Cookie refers to the data (usually encrypted) stored on the user's local terminal by some websites to identify users and track sessions ). For example, some websites need to log on to the

Google office was surprised to see that Python was originally an employee pet.

According to the latest foreign media reports, Google is well-known for its rapid instant search, but it has spent a lot of time searching for a 3 feet-long python, the python escaped from Google's Manhattan office.  This giant python is a pet of a

Python module psutil obtains the system status example

Obtaining the current operating status and load status of the operating system is a basic skill of the system administrator. This is closely related to our daily troubleshooting and problem locating, for example, to view the basic information of the

How to implement the import module of different levels of directories in python

Third-party module packages are often used for programming using python. You can use python setup install to install this package and import it through import XXX or from XXX import yyy. However, if the dependency package is self-written and you do

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