Jupyter was originally called "IPython NoteBook" and supports multiple languages. After installation, it can be programmed in the browser.
Today I recommend a free online Jupyter server:
1. Free: no cost
2. Online: you can log in and use it when you can access the Internet without occupying the resources of your computer
Login address: https://python.jupyter.vip/
Because it is free, there will be restrictions.
1. The first is the registration restriction: you need to verify your mobile phone to obtain an account and password, which can avoid one person registering multiple accounts, and verifying the mobile phone at the same time, which is equivalent to "real name", real users rarely abuse resources.
2. The second is resource limitation: it seems to limit the CPU and memory of each account, the number of running NoteBooks, etc. Of course, it is only used to learn python syntax, it is still enough!
Account application address: http://try.jupyter.vip