Mixin for tracking class attributes

TrackAttrsMixin.py

class TrackAttrsMixin:
    """
    Keep eye on TRACK_ATTRS, so we can know if they changed before doing any actions
    TRACK_ATTRS should not be empty
    """
    TRACK_ATTRS: Iterable[str] = ()

    def __init__(self, *args, **kwargs):
        if not self.TRACK_ATTRS:
            raise ValueError("TRACK_ATTRS should contain at least one value")
        
        super().__init__(*args, **kwargs)
        for field in self.TRACK_ATTRS:
            value = getattr(self, field)
            setattr(self, f"__original_{field}", value)

    def has_changed_attributes(self) -> bool:
        for field in self.TRACK_ATTRS:
            old_val = getattr(self, f"__original_{field}")
            new_val = getattr(self, field)
            if old_val != new_val:
                return True
        return False

    def attribute_changed(self, field: str) -> bool:
        if field in self.TRACK_ATTRS:
            old_val = getattr(self, f"__original_{field}")
            new_val = getattr(self, field)
            return old_val != new_val
        else:
            raise KeyError(f"Attribute {field} does not in tracked attributes")

    def get_original_attribute(self, field):
        if field not in self.TRACK_ATTRS:
            raise KeyError(f"Attribute {field} is not in the tracked attributes")
        return getattr(self, f"__original_{field}")