app.py

from flask import Flask, render_template, redirect, url_for

app = Flask(__name__)

@app.route("/")
def home():
    return render_template("index.html")

@app.route("/default")
def default():
    return render_template("layout.html")

@app.route("/variable")
def var():
    user = "Geeksforgeeks"
    return render_template("variable_example.html", name=user)

@app.route("/if")
def ifelse():
    user = "Practice GeeksforGeeks"
    return render_template("if_example.html", name=user)

@app.route("/for")
def for_loop():
    list_of_courses = ['Java', 'Python', 'C++', 'MATLAB']
    return render_template("for_example.html", courses=list_of_courses)

@app.route("/choice/<pick>")
def choice(pick):
    if pick == 'variable':
        return redirect(url_for('var'))
    if pick == 'if':
        return redirect(url_for('ifelse'))
    if pick == 'for':
        return redirect(url_for('for_loop'))

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