Fix improper way of setting defaults in test

henklaak · henklaak · commit 2ca47e107c1d · 2023-02-25T14:34:29.000+01:00
diff --git a/control/tests/xferfcn_test.py b/control/tests/xferfcn_test.py
@@ -10,7 +10,8 @@
 import control as ct
 from control import StateSpace, TransferFunction, rss, evalfr
 from control import ss, ss2tf, tf, tf2ss, zpk
-from control import isctime, isdtime, sample_system, defaults, reset_defaults
+from control import isctime, isdtime, sample_system
+from control import defaults, reset_defaults, set_defaults
 from control.statesp import _convert_to_statespace
 from control.xferfcn import _convert_to_transfer_function
 from control.tests.conftest import slycotonly, matrixfilter
@@ -990,8 +991,9 @@ def test_printing_zpk(self, zeros, poles, gain, output):
          ])
     def test_printing_zpk_format(self, zeros, poles, gain, format, output):
         """Test _tf_polynomial_to_string for constant systems"""
-        defaults['xferfcn.floating_point_format'] = format
         G = tf([1], [1,2,3], display_format='zpk')
+
+        set_defaults('xferfcn', floating_point_format=format)
         res = str(G)
         reset_defaults()
 
diff --git a/control/xferfcn.py b/control/xferfcn.py
@@ -78,6 +78,7 @@ def _float2str(value):
     formatter = "{:" + config.defaults.get('xferfcn.floating_point_format', ':.4g') + "}"
     return formatter.format(value)
 
+
 class TransferFunction(LTI):
     """TransferFunction(num, den[, dt])
 
