create database

app.py

@@ -2,6 +2,7 @@ from flask import Flask
 from flask_sqlalchemy import SQLAlchemy
 from flask_bcrypt import Bcrypt
 from flask_login import LoginManager
+import os
 
 app = Flask(__name__)
 app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///site.db'
@@ -15,5 +16,9 @@ login_manager.login_view = 'login'
 from routes import *
 from models import *
 
+if not os.path.exists('site.db'):
+    with app.app_context():
+        db.create_all()
+
 if __name__ == '__main__':
     app.run(debug=True)