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You can learn computer science concepts without a computer, but I have run Python on an Android phone, there's also online interpreters like repl.it that will allow you to code in a great many languages without installing anything more than a browser (the reviews says the app sucks).
You can use Termux - an Android terminal emulator and Linux environment app. Github | Install
Not sure if maybe https://stackblitz.com/ works on a phone.
Don't give up. Here's something that may help you: https://codesandbox.io/