def contains_block(self, header_hash: bytes32) -> bool:
    '\n        True if we have already added this block to the chain. This may return false for orphan blocks\n        that we have added but no longer keep in memory.\n        '
    return (header_hash in self.__block_records)
True if we have already added this block to the chain. This may return false for orphan blocks
that we have added but no longer keep in memory.
def contains_block(self, header_hash: bytes32) -> bool:
    '\n        True if we have already added this block to the chain. This may return false for orphan blocks\n        that we have added but no longer keep in memory.\n        '
    return (header_hash in self.__block_records)