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32 lines
1012 B
Python
32 lines
1012 B
Python
import attr
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def typed_attrs(cls):
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"""
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Created a type-validated attrs class.
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Attributes are set to their default values if they're assigned `None` to.
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"""
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for attrib in cls.__dict__.values():
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try:
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if not attrib.type:
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continue
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validator = attrib._validator
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except AttributeError:
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continue
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instance_of = attr.validators.instance_of(attrib.type)
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attrib._validator = (
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attr.validators.and_(validator, instance_of) if validator else instance_of
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)
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if attrib._default != attr.NOTHING:
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def converter(default):
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"""
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Create a converter that interprets `None` as "use default".
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Required in order to create a new lexical scope, see https://stackoverflow.com/a/233835
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"""
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return lambda x: default if x is None else x
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attrib.converter = converter(attrib._default)
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return attr.s(cls)
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