fix

Author: RitvikKapila

tox.ini

@@ -173,7 +173,7 @@ commands =
         # E203 is not PEP8 compliant https://github.com/ambv/black#slices
         # W503 is not PEP8 compliant https://github.com/ambv/black#line-breaks--binary-operators
         --ignore D103,E203,W503 \
-        --per-file-ignores = examples/test/legacy/v3_default_cmm.py: D401 \
+        --per-file-ignores 'examples/test/legacy/v3_default_cmm.py: D401' \
         examples/test/
 
 [testenv:pylint]