votes up 1

Tag '(key)' is already registered.

Package:
flask
github stars 56479
Exception Class:
KeyError

Raise code

""" 
            not true.
        """
        tag = tag_class(self)
        key = tag.key

        if key is not None:
            if not force and key in self.tags:
                raise KeyError(f"Tag '{key}' is already registered.")

            self.tags[key] = tag

        if index is None:
            self.order.append(tag)
        else:
            self.order.insert(index, tag)
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