same url_prefix for two flask blueprints
You can move the variable to the url_prefix parameter inside the registering statement :
@main_page.route("/")def home(): return render_template('home.html')app.register_blueprint(main_page, url_prefix='/')@category_page.route('/')def show(category): return render_template('{}.html'.format(category)) app.register_blueprint(category_page, url_prefix='/<category>')(it depends on the complexity of the whole pattern, but it may be better to keep the registering statements with the variables close to each function to handle many views.)