A class attribute provides a default that’s the same for all instances, but
does let you customize it with a simple attribute assignment. Which seems
like the right thing in this case.
class Cmd:
> PROMPT = '> '
>
> @property
> def prompt(self) -> str:
> return self.PROMPT
This makes .prompt a read-only instance attribute. So you then wouldn’t be
able to change it for a given instance.
Why make it an instance attribute if all instances will have the same one?
Unless you want to disallow overriding it in an instance.
If the reason is to make MyPy happy, then either there’s a big in your
code, or MyPy is being overly pedantic.
NOTE: accessing class attributes via self is standard practice — after all
methods are simply callable class attributes :-)
-CHB
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--
Christopher Barker, PhD (Chris)
Python Language Consulting
- Teaching
- Scientific Software Development
- Desktop GUI and Web Development
- wxPython, numpy, scipy, Cython
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