「TShark问题」pyshark lxml报错

使用pyshark（版本为0.4.2.11）时报错：

lxml.etree.xmlsyntaxerror: invalid character in attribute value

解决：将tshark_xml.py中的方法替换为：

def packet_from_xml_packet(xml_pkt, psml_structure=None):
    """
    Gets a TShark XML packet object or string, and returns a pyshark Packet objec.t

    :param xml_pkt: str or xml object.
    :param psml_structure: a list of the fields in each packet summary in the psml data. If given, packets will
    be returned as a PacketSummary object.
    :return: Packet object.
    """
    if not isinstance(xml_pkt, lxml.objectify.ObjectifiedElement):
        parser = lxml.objectify.makeparser(huge_tree=True, recover = True)
        # 原parser为 parser = lxml.objectify.makeparser(huge_tree=True)
        # 此时由于unicode转码出错导致程序报错
        xml_pkt = lxml.objectify.fromstring(xml_pkt, parser)
    if psml_structure:
        return _packet_from_psml_packet(xml_pkt, psml_structure)
    return _packet_from_pdml_packet(xml_pkt)