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Update dirtydelta to handle None

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This commit is contained in:
Steffo 2019-03-01 17:45:23 +01:00
parent da4af8cbea
commit 94c84d9b36
1 changed files with 14 additions and 2 deletions
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16
utils/dirty.py
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@ -16,8 +16,20 @@ class Dirty:
class DirtyDelta(Dirty): class DirtyDelta(Dirty):
@property @property
def delta(self): def delta(self):
return self.value - self.initial_value if self.initial_value is None:
initial_value = 0
else:
initial_value = self.initial_value
if self.value is None:
value = 0
else:
value = self.value
return value - initial_value
@delta.setter @delta.setter
def delta(self, value): def delta(self, value):
self.value = self.initial_value + value if self.initial_value is None:
initial_value = 0
else:
initial_value = self.initial_value
self.value = initial_value + value