Fix __nonzero__ for python 3

dstansby · dstansby · commit 5239042a001a · 2017-07-25T22:25:12.000+01:00
diff --git a/lib/matplotlib/testing/jpl_units/UnitDbl.py b/lib/matplotlib/testing/jpl_units/UnitDbl.py
@@ -116,7 +116,7 @@ def __nonzero__( self ):
       = RETURN VALUE
       - Returns true if the value is non-zero.
       """
-      return self._value.__nonzero__()
+      return self._value.__bool__()
 
    if six.PY3:
       __bool__ = __nonzero__
