Python3: __nonzero__

Author: dkrenn

src/sage/combinat/recognizable_series.py

@@ -614,7 +614,7 @@ def is_trivial_zero(self):
              not self[self.parent().indices()()])
 
 
-    def __nonzero__(self):
+    def __bool__(self):
         r"""
         Return whether this recognizable series is nonzero.
 
@@ -654,6 +654,9 @@ def __nonzero__(self):
         return True
 
 
+    __nonzero__ = __bool__
+
+
     def transposed(self):
         r"""
         Return the transposed series.