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🧩 Syntax:
from flask import Flask, request, make_response, redirect
app = Flask(__name__)
passcode = "1106"
todos = []
def check_passcode():
if 'passcode' in request.cookies and request.cookies['passcode'] == passcode:
return True
else:
return False
# Home page
@app.route("/")
def home():
if check_passcode():
todo_list = "<ul>"
for i, todo in enumerate(todos):
todo_list += f"<li>{todo} <a href='/delete_todo/{i}'>Delete</a></li>"
todo_list += "</ul>"
return f"""
<html>
<head>
<title>Hausaufgaben</title>
</head>
<body>
<h1>Hausaufgaben</h1>
<form action='/add_todo' method='POST'>
<label for='todo'>New To-Do:</label>
<input type='text' name='todo' id='todo' required>
<button type='submit'>Add</button>
</form>
{todo_list}
</body>
</html>
"""
else:
return redirect("/login")
# Login page
@app.route("/login")
def login():
return """
<html>
<head>
<title>Login</title>
</head>
<body>
<h1>Login</h1>
<form action='/validate_login' method='POST'>
<label for='passcode'>Passcode:</label>
<input type='password' name='passcode' id='passcode' required>
<button type='submit'>Submit</button>
</form>
</body>
</html>
"""
# Login validation
@app.route("/validate_login", methods=["POST"])
def validate_login():
if request.form['passcode'] == passcode:
resp = make_response(redirect("/"))
resp.set_cookie('passcode', passcode)
return resp
else:
return "Invalid passcode. Please try again."
# Add a new to-do
@app.route("/add_todo", methods=["POST"])
def add_todo():
todo = request.form['todo']
todos.append(todo)
return redirect("/")
# Delete a to-do
@app.route("/delete_todo/<int:index>")
def delete_todo(index):
todos.pop(index)
return redirect("/")
if __name__ == "__main__":
app.run(debug=True)