New submission from Rick Teachey <[email protected]>:
The dataclasses module is incredibly easy to use. This is a good thing. BUT one
downside is it will definitely be utilized by people who don't have a thorough
understanding of how it does what it does.
Even for me, despite having a very good understanding of how it works, after
heavily using it on a project for about 3 weeks now I made a mistake like the
one below:
class ImportantMixin:
def __init__(self):
super().__init__()
important_task()
@dataclass
class NaiveDClass(ImportantMixin):
data1 = int
data2 = int
I then went on along my merry way. Obviously, ImportantMixin.__init__ never
gets called and I didn't realize this until it was a bigger problem than it
should have been (should have written better tests! but I digress).
It would seem like a good idea for the dataclasses module to let the user know
they did this, probably via the warning system. Seems like it would be
relatively easy to do: if there is an init method being create, just inspect
the MRO for any previously defined init methods that weren't created by
dataclasses.
Thanks.
----------
components: Library (Lib)
messages: 316331
nosy: Ricyteach, eric.smith
priority: normal
severity: normal
status: open
title: add user notification that parent init will not be called in dataclass
init method
type: enhancement
versions: Python 3.8
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Python tracker <[email protected]>
<https://bugs.python.org/issue33452>
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