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Do not trigger event if identity of parameter value is unchanged #901

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Do not trigger event if identity of parameter value is unchanged #901

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fcf5c33
Make Comparator check for identity
philippjfr Jan 11, 2024
da8806a
Update tests
philippjfr Jan 11, 2024
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2 changes: 2 additions & 0 deletions param/parameterized.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2056,6 +2056,8 @@ def _changed(cls, event):
Predicate that determines whether a Event object has actually
changed such that old != new.
"""
if event.old is event.new:
return False
return not Comparator.is_equal(event.old, event.new)

def _instantiate_param(self_, param_obj, dict_=None, key=None, deepcopy=True):
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4 changes: 2 additions & 2 deletions tests/testwatch.py
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Expand Up @@ -183,7 +183,7 @@ def accumulator(change):
obj.a = 1
self.assertEqual(self.accumulator, 1)

def test_triggered_when_unchanged_complex_type(self):
def test_untriggered_when_unchanged_complex_type(self):
def accumulator(change):
self.accumulator += 1

Expand All @@ -193,7 +193,7 @@ def accumulator(change):
obj.a = subobj
self.assertEqual(self.accumulator, 1)
obj.a = subobj
self.assertEqual(self.accumulator, 2)
self.assertEqual(self.accumulator, 1)

def test_triggered_when_unchanged_if_not_onlychanged(self):
accumulator = Accumulator()
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