def __init__(self, nodes, contexts=None, dtype=object, sparse_fill_value=None, filter=False,
                 start_date=None):
        self.context_handler_dict = {}
        self.filter = filter
        self.dtype = object
        self.sparse_fill_value = None
        self.start_date = start_date

        self._finalized = False
        self._cached_dataframes = {}
        self._cached_columns = {}

        if isinstance(nodes, MDFNode):
            nodes = [nodes]
        
        self.nodes = nodes
        
        if contexts:
            assert len(contexts) == len(nodes)
        else:
            contexts = []

        self.contexts = contexts
        self._last_ctx = None
Timestamp of the packet.
dataset/ETHPy150Open manahl/mdf/mdf/builders/basic.py/DataFrameBuilder.__init__--crossover with--dataset/ETHPy150Open chrippa/python-librtmp/librtmp/packet.py/RTMPPacket.timestamp