What does join mean in python?

Python has two functions .join() and os.path.join(), which do the following：

. join()： Concatenate string arrays. Concatenates the elements of a string, a tuple, and a list with the specified characters (separator) to generate a new string

os.path.join()： Combine multiple paths and return

Add new content to the python dict

Adding new content to a dictionary is done by adding new key/value pairs, modifying or deleting existing key/value pairs as in the following examples

How to delete elements in python dict

clear() method is used to clear all the data in the dictionary, because it is an in-place operation, so it returns None (also can be interpreted as no return value)

python crawler how to get cookies

Cookie, refers to the data (usually encrypted) that some websites store on the user's local terminal in order to identify the user and perform session tracking. For example, some websites require login to access a page, before login, you want to grab the

How OpenCV tracks objects in video

Each frame of the video is a picture, tracking an object in the video, decomposition down, in fact, is to find that object in each frame of the picture.

OpenCV: pixel editing, geometric transformations, code optimization, some mathematical tools

Learn to read and edit pixel values, use image ROI and other basic operations. The four main points are as follows： Accessing pixel values and modifying them Accessing image properties Set the region of interest (ROI) Splitting and merging images

OpenCV: Introduction and installation, basic operation of images and videos

I've been learning OpenCV recently, and I'll attach the code that I can run directly here, so hopefully it will help people learning OpenCV. Content： Introduction to OpenCV Installation of OpenCV Image opening/saving Video/camera opening, frame opera

MoviePy, automatic editing of tiktok videos using Python

I recently saw a Github project where the author wrote a script to automatically generate tiktok videos using Python, and it's getting a lot of buzz.

How does FastAPI close the interface documentation?

FastApi comes with interface documentation, which saves us a lot of work when developing back-end interfaces. It automatically identifies the parameters of the interface based on your code and also generates a description of the interface based on your

How to migrate a legacy Flask application to an existing FastAPI project

Usually you have developed a project using Flask first, and then developed several interfaces using FastAPI, but you can't move them all to FastAPI for a while, so you need to let the previous Flask application access the existing FastAPI application

python walrus implements caching with expiration time and full-text search

python how to implement cache with expiration time, full text search, frequency limit In the previous article, I introduced you to using Python's own LRU cache to implement a cache with expiration time: One Day One Technique: Implementing an LRU Cache wi