The Python Operator module allows it to support functional programming. Suppose we need a function to calculate factorial, the general approach is to use recursion. If you use functional programming, there are two ways, one is to use lambda, the other is to use the arithmetic function of the Python Operator module.
In Python, you can use the os.remove method to remove files and folders, but sometimes it may resulting in some errors, this is because you do not master how to use the os.remove method correctly. This article will introduce how to use the python os.remove method correctly to avoid errors.
Web form is the basic component of a web application. It is a part of an HTML web page that is responsible for data collection. A web form consists of three parts: a form label, a form field, and a form button. Forms allow users to enter data and submit the user-entered data to web …
In the process of crawling web pages with a Python crawler, the first step is to crawl the URL. If there are many URLs on the web page, how to crawl all these URLs? This article describes two methods for a Python crawler to crawls all URLs on a Web page.
Python crawler can crawl not only static web pages but also dynamic web pages. However, the new version of selenium doesn’t support PhantomJS and can’t crawl dynamic web pages. Therefore, we should abandon PhantomJS and use headless ChromeDriver directly. This article will tell you how to install ChromeDriver.
Session is a data structure saved on the server-side, which is used to track the status of users. This data can be saved in clusters, databases, and files. Cookie is a mechanism for clients to save user data, and it is also a way to implement Session. This article introduces how to manage Session and …
When using Scrapy to develop a crawler, you usually need to create a Scrapy project. You can create a Scrapy project with the command scrapy startproject TestScrapyProject like below.
There is no difference between installing Scrapy and installing other Python packages, just to run the pip install scrapy command to install it. If you run the command in a command-line window, you will see that the program does not download and install python Scrapy immediately, but a large number of third-party packages are constantly …
Python fnmatch module can support UNIX shell style filename matching. And the python fnmatch matches support the following wildcards and functions.
The python os.path module provides some methods to operate a directory. This module provides the following methods for you to use. This article will show you how to use them with examples.