custom_xml_parts not available on Linux

[gundarsk]

Document object is missing part.custom_xml_parts on Linux.
I have the same code on Windows and Ubuntu. The same repo and the same file.
On Windows, Document instance under part returns custom_xml_parts. Under Linux there is no such field in parts.

from docx import Document
from lxml import etree
import datetime

# read document in IOByte
doc = Document('samples/Document-00.docx')

# This code fails on Linux and works on Windows on the same docx file. On Linux there is not such field custom_xml_parts
custom_xml_parts = doc.part.custom_xml_parts
# list all custom_xml_parts
Xea_xml = None
for i, custom_xml in enumerate(custom_xml_parts):
    # check if exists attrib "author" and it is "XXX"
    if (custom_xml.attrib.get('author') == 'XXX'):
        Xea_xml = custom_xml
        break```
 

[scanny]

I expect you're working on a fork that added DocumentPart.custom_xml_parts. There is no such attribute in this project.