package.py -> command.py

a

src/command.py

@@ -0,0 +1,14 @@
+import subprocess
+
+from typing import Optional
+
+def package_installed(package_name: str) -> Optional[bool]:
+	try:
+		installed = subprocess.run(["dpkg", "-s", package_name], stdout=subprocess.PIPE, stderr=subprocess.PIPE).returncode == 0
+		if not installed:
+			print(f"Package \"{package_name}\" not installed.")
+		return installed
+	except Exception as err:
+		print(err)
+		return None
+