Add helper for handling exceptions on missing dependencies.

diff --git a/py/setup.py b/py/setup.py
new file mode 100644 (file)
index 0000000..1070335
--- /dev/null
+++ b/py/setup.py
@@ -0,0 +1,8 @@
+"""Setup management."""
+from sys import exit as sys_exit
+
+
+def dependency_hint(e: Exception) -> None:
+    'Provide helpful advice on missing dependency exception.'
+    print(f'Missing dependency: {e}. Please run with "install_deps" argument.')
+    sys_exit(1)