Greasy Fork

The userscript could possibly be reduced to only this. Even better would be having it as a userstyle.

// ==UserScript==
// @name        Hide Solution Button - learnpython.org
// @namespace   Violentmonkey Scripts
// @match       https://www.learnpython.org/*
// @grant       GM_addStyle
// @version     1.0
// @author      Sergey Zhdanov
// @description Hide Solution Button at learnpython.org interactive courses
// @license     MIT
// ==/UserScript==

GM_addStyle(`.dcl-btn-secondary[uib-tooltip="Show Solution"] { display: none; }`);