message_ix_models.model.transport.util.path_fallback

message_ix_models.model.transport.util.path_fallback(context_or_regions: Context | str, *parts) → Path

Return a Path constructed from parts.

If context.model.regions (or a string value as the first argument) is defined and the file exists in a subdirectory of data/transport/regions/, return its path; otherwise, return the path in data/transport/.