Message360752
After instantiation of a variable of a DataClass, it is possible to assign new attributes (that were not defined in defining the DataClass):
data.new_attribute = 3.0 # does NOT raise Error!
This gives unexpected behaviour: if you print the variable, then 'new_attribute' is not printed (since it is not in the definition of the DataClass).
Assigning to an attribute is therefore not typo-safe (which users may expect from a DataClass).
I would expect the behaviour of the DataClass be consistent and typo-safe.
Attached is a file that demonstrates the bug (behaviour) and provides a 'SafeDataClass' by overriding the __setattr__ method.
My suggestion would be to the adjust the library __setattr__ for the DataClass such that is will be typo-safe. |
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Date |
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Action |
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2020-01-27 11:09:27 | marcelpvisser | set | recipients:
+ marcelpvisser |
2020-01-27 11:09:27 | marcelpvisser | set | messageid: <1580123367.77.0.985368571212.issue39462@roundup.psfhosted.org> |
2020-01-27 11:09:27 | marcelpvisser | link | issue39462 messages |
2020-01-27 11:09:27 | marcelpvisser | create | |
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