Remove public isnap setter

Author: amorison

stagpy/_step.py

@@ -449,14 +449,6 @@ def isnap(self):
                 self._isnap = None
         return self._isnap
 
-    @isnap.setter
-    def isnap(self, isnap):
-        """Fields snap corresponding to time step"""
-        try:
-            self._isnap = int(isnap)
-        except ValueError:
-            pass
-
 
 class EmptyStep(Step):
 

stagpy/stagyydata.py

@@ -403,7 +403,7 @@ def _bind(self, isnap, istep):
             istep (int): time step index.
         """
         self._isteps[isnap] = istep
-        self.sdat.steps[istep].isnap = isnap
+        self.sdat.steps[istep]._isnap = isnap
 
     @property
     def last(self):