Programmer Group

1, Classes and objects Example 1 class Employee: 'Base class of employee' empCount = 0 def __init__(self, name, salary): self.name = name self.salary = salary Employee.empCount += 1 def displayEmployee(self): print "Name : ", self.name, ", Salary : ", self.salary # Create the first instance emp1 = Empl ...

①base64 Base64 is a method of representing arbitrary binary data in 64 characters. When using Notepad to open exe, jpg, pdf files, we will see a lot of garbled code, because binary files contain many characters that cannot be displayed and printed, so if you want text processing software like Notepad to be able to process binary data, you ne ...

1, init and new methods __The main differences between init and new are:1. Init is usually used to initialize a new instance and control the initialization process, such as adding some properties and doing some extra operations, which occurs after the class instance is created. It is an instance level method.2. New is usually used to control th ...

Install devpi Summary devpi consists of three components: Devpi server: provides image and cache functions, deploys in the DMZ area of the enterprise, and improves the efficiency of downloading python package Devpi Web: provide web interface and query function Devpi client: command line tool, providing package upload and other functions d ...

notes preceding the text of a book or following the title of an article It is said that virtualenv, fabric and pip are the three magic tools of Python. Whether you agree or not, at least first, pip is often used now. virtualenv heard it for the first time, but I have to try it. 1, Installation pip install virtualenv Because I have already insta ...

notes preceding the text of a book or following the title of an article Introduce the methods of map, reduce, and filter built-in functions in Python 1: map map(...) map(function, sequence[, sequence, ...]) -> list Execute function(item) for item in sequence, and output the result as list. >>> map(str, range(5)) #st ...

Today, when I was playing Weibo, I accidentally thought of using python to crawl and download a few pictures. However, it is found that Weibo is different from ordinary websites, To get a little content, you need to get a cookie from the browser first. Otherwise, it can't jump automatically. At present, I haven't found a good solution, so I fo ...

Recently, in conscious python, I saw Zhihu's last article (https://www.zhihu.com/question/20799742), and I climbed the video on welfare net... I started to follow suit, but the example given by the respondent is based on python2.x, and I started to learn 3.x. after changing the print usage, there are still many modules that can't be imported, a ...

1. Reflection Reflection: using string type names to manipulate variables Reflection has no security problem. It can operate the existing variables in memory   #Attributes and methods in reflective objects class A: price=20 print(getattr(A,'price')) #Reflecting object properties class A: def func(self): print('in func') a =A ...

The first few articles mainly introduced the knowledge of using delphi to develop back door and simple remote control. Some partners said delphi was out of date and nobody used it. But I think programming language is just a way to realize functions, just use the language you are familiar with or like. DELPHI hacker programming (1): implementati ...