Explain unexpeced top-level type (#383)

Might help in reported issues like #342
wireviz · Jun 11, 2024 · 32e4824 · 32e4824
1 parent 954c4f5
commit 32e4824
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/src/wireviz/wireviz.py b/src/wireviz/wireviz.py
@@ -86,6 +86,9 @@ def parse(
         raise Exception("No output formats or return types specified")
 
     yaml_data, yaml_file = _get_yaml_data_and_path(inp)
+    assert isinstance(
+        yaml_data, dict
+    ), f"Expected a dict/map as top-level YAML input, but got: {type(yaml_data)}"
     if output_formats:
         # need to write data to file, determine output directory and filename
         output_dir = _get_output_dir(yaml_file, output_dir)