Untitled

from flask import Flask

app = Flask(__name__)

@app.route("/")
def main():
    return "Hello world"


def generate_style(class_name, color):
    style = f"<style> .{class_name} {{ background-color: {color} }}</style>"
    return style

@app.route("/user/<id>")
def user(id):
    style_tag = generate_style("red", "red")
    whole_page = """<html><head>{}</head><body><div class="red">Hello user number {}</div></body></html>""".format(style_tag, id)
    return whole_page

if __name__ == "__main__":
    app.run(debug=True)