-test -f "$inst/your/two.py"
-test -f "$inst/your/two.pyc"
-test -f "$inst/your/two.pyo"
-test ! -e "$inst/my/one.py"
-test ! -e "$inst/my/one.pyc"
-test ! -e "$inst/my/one.pyo"
+test -f "$inst/your/two.py"
+py_installed "$inst/your/two.pyc"
+py_installed "$inst/your/two.pyo"
+py_installed --not "$inst/my/one.py"
+py_installed --not "$inst/my/one.pyc"
+py_installed --not "$inst/my/one.pyo"