Python

In the previous article, we talked about how to write a daemon in Python on Linux. The main principle is to use the Linux fork function to create a process, and then exit the parent process to run, the resulting child process will become a daemon.

Common List Object action methods: List.append (x) Add an element to the end of the list, equivalent to A[len (a):] = [x]. List.extend (L) Adds all the elements in a given list to another list, equivalent to A[len (a):] = L. List.insert (i, X)

In general, the access rules for class instance properties are more intuitive in python. However, there are still some areas that are not intuitive, especially for C + + and Java programmers. Here, we need to understand the following areas:

Common functions in random modules Copy Code code as follows: Random () Returns a real number in the interval [0,1]; Uniform (A, B) Returns a real number in the interval [a,b]; Randint (A, B) Returns an integer in the

The example in this article tells a list of Python mappings. Share to everyone for your reference. The specific analysis is as follows: List mapping is a useful way to transform data by applying a function to each element of the list, and you can

The zip file is one of the packaging formats that we often use, and it is efficient to extract and compress the python zip. Python Unzip zip document: Copy Code code as follows: #/usr/bin/python #coding =utf-8 Import

After the general installation of Python, I will first install some commonly used package. Make a note and write it down for enquiries: Web Frameworks Tornado, visit: http://www.tornadoweb.org/en/stable/FLASK, visit: http://flask.pocoo.org/web.py,

#-*-coding:utf-8-*-Import datetime #给定日期向后N天的日期 def dateadd_day (days): D1 = Datetime.datetime.now () d3 = D1 + D Atetime.timedelta (days) return D3 #昨天 def getyesterday (): Today = Datetime.date.today () oneday = Datetime.timedelt A (Days=1)

GetAttr The ' getattr ' function belongs to the built-in function, and can be obtained by using the function name Copy Code code as follows: Value = Obj.attribute Value = GetAttr (obj, "attribute") Use ' getattr ' to

Look at the map first. The map () function receives two parameters, one is a function, the other is a sequence, and map functions the passed-in function to each element of the sequence and returns the result as a new list. For example, for example,

The examples in this article describe how Python transforms XML and XSL into HTML. Share to everyone for your reference. The specific analysis is as follows: You need to use LIBXML2, so you have to install the LIBXML2 module before you can use it.

This article positioning: The CPU history data has been saved, waiting for visualization analysis, can not be thought of for a moment.This article is a follow-up to the previous article (http://www.jb51.net/article/61956.htm), which mentions how to

This article locates the situation where you want to call the top command in Python to get CPU usage but there is no idea for the moment.If you simply want to get CPU utilization, you can easily do this by using the top command redirection, which

This article describes how Python receives Gmail's new mail and sends it to gtalk. Share to everyone for your reference. The implementation method is as follows: #!/usr/bin/env python #-*-coding:utf-8-*-import imaplib Import string, random

Change a wallpaper every day, a good mood every day. #-*-Coding:utf-8-*-from __future__ import unicode_literals import Image import datetime import Win32gui,win32con,w IN32API import re from httpwrapper import sendrequest storefolder =

This article illustrates how Python gets the size and size of a remote picture. Share to everyone for your reference. The specific analysis is as follows: This code opens the remote picture through the URLLIB2, reads the file content through the

This example describes the Python probability calculator implementation. Share to everyone for your reference. The implementation method is as follows: From random import randrange #randrange form random Module def calc_prob (strengths): "" "A

This example describes how to display download progress when Python downloads files. Share to everyone for your reference. The specific analysis is as follows: Put this code in your script, like this: Urllib.urlretrieve (GetFile, SaveFile,

Record a piece of audio, change its pitch 50 times and match each new audio to a key on the keyboard, and you can turn the computer into a piano! A section of audio can be encoded as an array (or list) of numeric values, like this: We can take a

More and more data scientists have been using Python recently, and I can't help but think that although they have benefited from the libraries of Pandas, Scikit-learn and NumPy, they may have missed some of the older but equally helpful python