Forgot to import os

app.py

@@ -1,6 +1,7 @@
 from flask import Flask, render_template, request, redirect, url_for
 import subprocess
 import re
+import os
 from waitress import serve
 
 allowed_pattern = r'^[a-zA-Z0-9.]+$'

tmp/password.tmp

@@ -0,0 +1 @@
+aaaaaaaaa44545