Создайте вложенный цикл при разборе XML в Python

Question

Я работаю с XML, который может иметь несколько дочерних элементов для каждого родительского узла. В качестве части вывода я хочу дублировать теги из разных частей документа.

Пример кода

import csv
import time
import pprint
import StringIO
from lxml import etree

# Handle Namespaces
ns = {'x': 'urn:hl7-org:v3', 'sdtc': 'urn:hl7-org:sdtc', 'xsi': 'http://www.w3.org/2001/XMLSchema-instance'}

# Input XML
input_xml = \
'<Document xmlns="urn:hl7-org:v3" xmlns:sdtc="urn:hl7-org:sdtc" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" classCode="DOCCLIN" moodCode="EVN"> \
    <code code="34133-9" displayName="Summarization of Episode Note"/> \
    <recordTarget contextControlCode="OP" typeCode="RCT"> \
        <patientRole classCode="PAT"> \
            <id assigningAuthorityName="MRN" extension="MRN123456"/> \
            <id assigningAuthorityName="SSN" extension="SSN123456"/> \
        </patientRole> \
    </recordTarget> \
    <component typeCode="COMP"> \
        <component contextConductionInd="true" typeCode="COMP"> \
            <section> \
                <code code="11348-0" displayName="HISTORY OF PAST ILLNESS"/> \
                <entry> \
                    <observation classCode="OBS" moodCode="EVN"> \
                        <value code="401.9" displayName="Hypertension, unspecified" xsi:type="CD" /> \
                    </observation> \
                </entry> \
                <entry> \
                    <observation classCode="OBS" moodCode="EVN"> \
                        <value code="250.00" displayName="Diabetes Mellitus" xsi:type="CD" /> \
                    </observation> \
                </entry> \
            </section> \
        </component> \
        <component contextConductionInd="true" typeCode="COMP"> \
            <section> \
                <code code="10160-0" codeSystem="2.16.840.1.113883.6.1"/> \
                <entry typeCode="DRIV"> \
                    <substanceAdministration classCode="SBADM" moodCode="INT"> \
                        <consumable> \
                            <manufacturedMaterial> \
                                <code code="636676" displayName="Chantix Continuing Month Box 1 mg tablet"/> \
                            </manufacturedMaterial> \
                        </consumable> \
                    </substanceAdministration> \
                </entry> \
                <entry typeCode="DRIV"> \
                    <substanceAdministration classCode="SBADM" moodCode="INT"> \
                        <consumable> \
                            <manufacturedMaterial> \
                                <code code="1651272" displayName="Stiolto Respimat 2.5 mcg"/> \
                            </manufacturedMaterial> \
                        </consumable> \
                    </substanceAdministration> \
                </entry> \
            </section> \
        </component> \
    </component> \
</Document> '

dict_header = {
    "id_type": "",
    "id": "",
    "section_code": "",
    "section_name": "",
    "code_code": "",
    "code_name": ""
    }

# Parse XML; get tree and root
tree = etree.parse(StringIO.StringIO(input_xml))
root = tree.getroot()

# --------------------------------------
# Document -> recordTarget
# --------------------------------------
record_target = tree.xpath("//x:Document/x:recordTarget", namespaces=ns)

for record in record_target:

    ids = record.xpath(".//x:id", namespaces=ns)

    for id in ids:

        dict_header["id_type"] = id.xpath(".//@assigningAuthorityName", namespaces=ns)
        dict_header["id"] = id.xpath(".//@extension", namespaces=ns)

# --------------------------------------
# Document -> Component
# --------------------------------------
document_components = tree.xpath("//x:Document/x:component/x:component", namespaces=ns)

for component in document_components:

    # Component -> Section
    # --------------------------------------
    component_sections = component.xpath(".//x:section", namespaces=ns)

    for section in component_sections:
        dict_header["section_code"] = section.xpath("./x:code/@code", namespaces=ns)
        dict_header["section_name"] = section.xpath("./x:code/@displayName", namespaces=ns)

        # Section -> Entries
        # --------------------------------------
        section_entries = section.xpath(".//x:entry", namespaces=ns)

        for entry in section_entries:

            dict_header["code_code"] = entry.xpath(".//x:code/@code | .//x:value/@code", namespaces=ns)
            dict_header["code_name"] = entry.xpath(".//x:code/@displayName | .//x:value/@displayName", namespaces=ns)

            # Test Printing
            pprint.pprint(dict_header)

Ожидаемый результат

id_type|id|section_code|section_name|code_code|code_name
SSN|SSN123456|11348-0|HISTORY OF PAST ILLNESS|401.9|Hypertension, unspecified
SSN|SSN123456|11348-0|HISTORY OF PAST ILLNESS|250.00|Diabetes Mellitus
SSN|SSN123456|10160-0||636676|Chantix Continuing Month Box 1 mg tablet
SSN|SSN123456|10160-0||1651272|Stiolto Respimat 2.5 mcg
MRN|MRN123456|11348-0|HISTORY OF PAST ILLNESS|401.9|Hypertension, unspecified
MRN|MRN123457|11348-0|HISTORY OF PAST ILLNESS|250.00|Diabetes Mellitus
MRN|MRN123458|10160-0||636676|Chantix Continuing Month Box 1 mg tablet
MRN|MRN123459|10160-0||1651272|Stiolto Respimat 2.5 mcg

Я могу продублировать строки для последних дочерних узлов, по которым я перебираю, но мне нужна помощь в создании вида перекрестного соединения / вложенного цикла для дублирования строк, когда в любом узле есть несколько дочерних узлов.