Class _Node

web/db.py:1563–1578

class _Node:
    def __init__(self, type, first, second=None):
        self.type = type
        self.first = first
        self.second = second

    def __eq__(self, other):
        return (
            isinstance(other, _Node)
            and self.type == other.type
            and self.first == other.first
            and self.second == other.second
        )

    def __repr__(self):
        return f"Node({self.type!r}, {self.first!r}, {self.second!r})"


class Parser: