fix for issue 410.11.15

1 files changed, 4 insertions, 1 deletions

diff --git a/representer.py b/representer.py
index 7498443..b4625bf 100644
--- a/representer.py
+++ b/representer.py
@@ -199,7 +199,10 @@ class BaseRepresenter(object):
 class SafeRepresenter(BaseRepresenter):
 
     def ignore_aliases(self, data):
-        if data in [None, ()]:
+        # https://docs.python.org/3/reference/expressions.html#parenthesized-forms :
+        # "i.e. two occurrences of the empty tuple may or may not yield the same object"
+        # so "data is ()" should not be used
+        if data is None or data == ():
             return True
         if isinstance(data, (binary_type, text_type, bool, int, float)):
             return True