imported os

app.py

+import os
 import secrets
 from flask import Flask, render_template, request, redirect, url_for, send_from_directory, abort
 from flask_sqlalchemy import SQLAlchemy
@@ -7,6 +8,7 @@ app.config['SEND_FILE_MAX_AGE_DEFAULT'] = 0
 app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///site.db'
 app.config['SECRET_KEY'] = secrets.token_hex(16)
 
+
 db = SQLAlchemy(app)
 
 class Project(db.Model):
@@ -84,6 +86,5 @@ def download_assessment(filename):
         print(f"Error serving assessment file: {str(e)}")
         app.logger.exception(f"Error serving assessment file: {str(e)}")
         abort(500) 
-
 if __name__ == '__main__':
-    app.run(debug=True, port=int(os.environ.get('PORT', 8080)))
+    app.run(debug=True, port=int(os.environ.get('PORT', 8080)))
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