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app.py

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+from flask import Flask, render_template, request, redirect, url_for, session, make_response
+import sqlite3
+from datetime import timedelta
+import seaborn as sns
+from sklearn.linear_model import LogisticRegression
+import numpy as np
+
+# Flask app setup
+app = Flask(__name__)
+app.secret_key = "supersecretkey"  # Change this to a secure key in production
+app.permanent_session_lifetime = timedelta(days=7)
+
+
+# Helper function to connect to SQLite database
+def get_db_connection():
+    conn = sqlite3.connect("users.db")
+    conn.row_factory = sqlite3.Row
+    return conn
+
+
+# Initialize database with users table
+def init_db():
+    conn = get_db_connection()
+    conn.execute("""
+        CREATE TABLE IF NOT EXISTS users (
+            id INTEGER PRIMARY KEY AUTOINCREMENT,
+            username TEXT UNIQUE NOT NULL,
+            password TEXT NOT NULL
+        )
+    """)
+    conn.commit()
+    conn.close()
+
+# Initialize DB at startup
+init_db()
+
+
+# Home page -> always redirect to login
+@app.route("/")
+def home():
+    return redirect(url_for("login"))
+
+# Load dataset and train model once
+iris_data = sns.load_dataset("iris")
+X = iris_data.iloc[:, 0:4].values
+y = iris_data.iloc[:, 4].values
+model = LogisticRegression(max_iter=300)
+model.fit(X, y)
+
+@app.route('/predict', methods=['POST'])
+def predict_flower():
+    try:
+        # Get data from form
+        sl = float(request.form['sl'])
+        sw = float(request.form['sw'])
+        pl = float(request.form['pl'])
+        pw = float(request.form['pw'])
+
+        # Predict
+        prediction = model.predict([[sl, sw, pl, pw]])
+        result = prediction[0]
+
+        return render_template("form.html", result=result)
+
+    except Exception as e:
+        return render_template("form.html", result=f"Error: {str(e)}")
+
+@app.route('/form')
+def show_form():
+    return render_template("form.html")
+
+# Signup page
+@app.route("/signup", methods=["GET", "POST"])
+def signup():
+    if request.method == "POST":
+        username = request.form["username"]
+        password = request.form["password"]
+
+        conn = get_db_connection()
+        try:
+            conn.execute("INSERT INTO users (username, password) VALUES (?, ?)", (username, password))
+            conn.commit()
+            conn.close()
+            return redirect(url_for("login"))
+        except sqlite3.IntegrityError:
+            return "Username already exists! Try another."
+
+    return render_template("signup.html")
+
+
+# Login page
+@app.route("/login", methods=["GET", "POST"])
+def login():
+    if request.method == "POST":
+        username = request.form["username"]
+        password = request.form["password"]
+        remember = request.form.get("remember")
+
+        conn = get_db_connection()
+        user = conn.execute(
+            "SELECT * FROM users WHERE username=? AND password=?", 
+            (username, password)
+        ).fetchone()
+        conn.close()
+
+        if user:
+            session.permanent = (remember == "on")
+            session["username"] = username
+
+            resp = make_response(redirect(url_for("index")))  # Go to index.html after login
+            resp.set_cookie("last_visit", "Welcome back, " + username,
+                            max_age=(7*24*60*60 if remember == "on" else None))
+            return resp
+        else:
+            return "Invalid username or password. Try again."
+    return render_template("login.html")
+
+
+# Index page - accessible only if logged in
+@app.route("/index")
+def index():
+    username = session.get("username")
+    if not username:
+        return redirect(url_for("login"))
+    last_visit = request.cookies.get("last_visit", "First time visiting!")
+    return render_template("index.html", username=username, last_visit=last_visit)
+
+
+# Logout route
+@app.route("/logout")
+def logout():
+    session.pop("username", None)
+    resp = make_response(redirect(url_for("login")))
+    resp.set_cookie("last_visit", "", expires=0)
+    return resp
+
+
+
+# Run the app
+if __name__ == "__main__":
+    app.run(debug=True, host="0.0.0.0", port=5000)