--- argh-0.31.3/tox.ini.orig
+++ argh-0.31.3/tox.ini
@@ -31,8 +31,6 @@
 extras = test
 commands =
     pytest {posargs:tests}
-setenv =
-    PYTHONPATH=src
 
 [testenv:as-module]
 description = run unit tests, ensure they don't depend on specific prog name