Fixed bug in unitconversions._All._import_all() where self.__all__ wasn't always changed from None to an empty list before appending things to it.

Author: zakv

labscript_utils/unitconversions/__init__.py

@@ -26,14 +26,15 @@ class _All(object):
 
     def __getitem__(self, ix):
         if self.__all__ is None:
-            self.__all__ = []
             self._import_all()
         return self.__all__[ix]
 
     def _import_all(self):
         """imports all unit conversion classes in module within this subpackage into
         this module's globals. This is used only for backward compatibility with unit
         conversion classes that were not specified with a fully qualified name"""
+        if self.__all__ is None:
+            self.__all__ = []
         for filename in os.listdir(os.path.split(__file__)[0]):
             if filename.endswith('.py') and filename != '__init__.py':
                 module = filename[:-3]