From 2d33117c95d4bb3802b7bab4c436d97b01f1c00f Mon Sep 17 00:00:00 2001 From: Nikolaus Waxweiler Date: Thu, 12 Dec 2019 11:32:13 +0000 Subject: [PATCH] Legible error message for axis mapping duplicate check --- Lib/fontTools/varLib/__init__.py | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) diff --git a/Lib/fontTools/varLib/__init__.py b/Lib/fontTools/varLib/__init__.py index 66dfa3572..b428580d6 100644 --- a/Lib/fontTools/varLib/__init__.py +++ b/Lib/fontTools/varLib/__init__.py @@ -141,8 +141,14 @@ def _add_avar(font, axes): assert axis.maximum == max(keys) assert axis.default in keys # No duplicates - assert len(set(keys)) == len(keys) - assert len(set(vals)) == len(vals) + assert len(set(keys)) == len(keys), ( + f"{axis.tag} axis: All axis mapping input='...' " + "values must be unique, but we found duplicates." + ) + assert len(set(vals)) == len(vals), ( + f"{axis.tag} axis: All axis mapping output='...' " + "values must be unique, but we found duplicates." + ) # Ascending values assert sorted(vals) == vals