from flask import Flask, render_template, request, redirect, url_for ''' Red underlines? Install the required packages first: Open the Terminal in PyCharm (bottom left). On Windows type: python -m pip install -r requirements.txt On MacOS type: pip3 install -r requirements.txt This will install the packages from requirements.txt for this project. ''' app = Flask(__name__) all_books = [] @app.route('/') def home(): pass @app.route("/add") def add(): pass if __name__ == "__main__": app.run(debug=True)