use super() for LTI functions

murrayrm · murrayrm · commit 316945dcf5a2 · 2022-03-19T22:56:59.000-07:00
diff --git a/control/frdata.py b/control/frdata.py
@@ -204,7 +204,7 @@ def __init__(self, *args, **kwargs):
                         w=1.0/(absolute(self.fresp[i, j, :]) + 0.001), s=0.0)
         else:
             self.ifunc = None
-        LTI.__init__(self, self.fresp.shape[1], self.fresp.shape[0])
+        super().__init__(self.fresp.shape[1], self.fresp.shape[0])
 
     def __str__(self):
         """String representation of the transfer function."""
diff --git a/control/namedio.py b/control/namedio.py
@@ -131,8 +131,7 @@ class _NamedIOStateSystem(_NamedIOSystem):
     def __init__(
             self, inputs=None, outputs=None, states=None, name=None):
         # Parse and store the system name, inputs, and outputs
-        _NamedIOSystem.__init__(
-            self, inputs=inputs, outputs=outputs, name=name)
+        super().__init__(inputs=inputs, outputs=outputs, name=name)
 
         # Parse and store the number of states
         self.set_states(states)
diff --git a/control/statesp.py b/control/statesp.py
@@ -309,8 +309,7 @@ def __init__(self, *args, keywords=None, **kwargs):
             D = np.zeros((C.shape[0], B.shape[1]))
         D = _ssmatrix(D)
 
-        # TODO: use super here?
-        LTI.__init__(self, inputs=D.shape[1], outputs=D.shape[0])
+        super().__init__(inputs=D.shape[1], outputs=D.shape[0])
         self.A = A
         self.B = B
         self.C = C
diff --git a/control/xferfcn.py b/control/xferfcn.py
@@ -233,7 +233,7 @@ def __init__(self, *args, **kwargs):
                 if zeronum:
                     den[i][j] = ones(1)
 
-        LTI.__init__(self, inputs, outputs)
+        super().__init__(inputs, outputs)
         self.num = num
         self.den = den
 
