Change system lister dir return value type

Return a list instead of a frozenset. Fixes #425
2016-08-19 10:21:21 +02:00
parent 4545f3ac49
commit 2fa76c2cfd
1 changed files with 1 additions and 1 deletions
--- a/pint/systems.py
+++ b/pint/systems.py
@@ -434,7 +434,7 @@ class Lister(object):
        self.d = d

    def __dir__(self):
-        return frozenset(self.d.keys())
+        return list(self.d.keys())

    def __getattr__(self, item):
        return self.d[item]