Update app.py

app.py

@@ -1,3 +1,13 @@
+import subprocess
+import sys
+
+# Function to install a package using pip
+def install_package(package):
+    subprocess.check_call([sys.executable, "-m", "pip", "install", package])
+
+# Install Flask
+install_package("flask")
+
 from flask import Flask, render_template_string
 
 app = Flask(__name__)