Update app.py

app.py

@@ -1,6 +1,42 @@
-### llama-index
-pip uninstall llama-index
-pip install llama-index
+### Upgrade pip
+
+import sys
+import subprocess
+
+def upgrade_pip():
+    try:
+        subprocess.check_call([sys.executable, '-m', 'pip', 'install', '--upgrade', 'pip'])
+        print("pip upgraded successfully.")
+    except subprocess.CalledProcessError as e:
+        print(f"An error occurred while upgrading pip: {e}")
+
+# Upgrade pip
+upgrade_pip()
+
+### Uninstall a Package
+
+def uninstall_package(package_name):
+    try:
+        subprocess.check_call([sys.executable, '-m', 'pip', 'uninstall', package_name, '-y'])
+        print(f"Package '{package_name}' uninstalled successfully.")
+    except subprocess.CalledProcessError as e:
+        print(f"An error occurred while uninstalling package '{package_name}': {e}")
+
+# Example usage
+# uninstall_package('example-package')
+uninstall_package('llama-index')
+
+### Install a Package
+
+def install_package(package_name):
+    try:
+        subprocess.check_call([sys.executable, '-m', 'pip', 'install', package_name])
+        print(f"Package '{package_name}' installed successfully.")
+    except subprocess.CalledProcessError as e:
+        print(f"An error occurred while installing package '{package_name}': {e}")
+
+# Example usage
+install_package('llama-index')
 
 ### Set Up the Language Model