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WolfDocx - unreadable content

How do you prevent Word's unreadable content warning after a python-docx save?

If Word reports unreadable content in document.xml after a python-docx save, first distinguish malformed XML from a structurally invalid Word document. The warning alone does not establish that python-docx caused the damage. Keep a known-good source, avoid raw XML string replacement, and use an edit workflow that verifies its output rather than trying to suppress Word's repair prompt.

Find the first failing stage, not just the last save

Keep the original template and each intermediate output. Check whether the source already triggers the warning, then reduce the script to the first change that introduces it. Record the part and location Word identifies. A failure in word/document.xml concerns the main story, while a header or relationship error may identify another package member. Do not overwrite the only copy with a repaired document.

XML syntax and WordprocessingML structure are separate checks. A bare ampersand inserted by replacing strings in serialized XML can make that XML unparsable. Valid XML can still violate Word's document structure. For example, the python-docx cell documentation explains that a cell must end with a paragraph and that add_table adds that paragraph automatically. Removing it through private XML manipulation bypasses that invariant. This is a concrete structural hazard, not a diagnosis of every unreadable-content warning.

Change a valid template without editing serialized XML

Install the public MIT package with pip install wolfdocx==0.1.0. Prepare a valid template containing the literal placeholder shown below in ordinary body text. This example uses the published Document API, checks that the replacement applied, and saves to a new destination. It does not require the Commercial reporting API used by some other guides.

from pathlib import Path
from zipfile import ZipFile
from xml.etree import ElementTree as ET

from wolfdocx import Document

source = Path("reviewed_template.docx")  # Valid DOCX with literal {{client}}
output = Path("contract.docx")  # Must not already exist


def check_xml(path):
    with ZipFile(path) as package:
        bad_member = package.testzip()
        if bad_member is not None:
            raise ValueError(f"ZIP checksum failed: {bad_member}")
        for name in package.namelist():
            if name.endswith((".xml", ".rels")):
                ET.fromstring(package.read(name))


check_xml(source)
with Document(source) as document:
    edit = document.find_replace(r"\{\{client\}\}", "A & B Legal")
    assert edit.status == "applied", edit.code
    report = document.save(output)
assert report.passed, report.code
check_xml(output)
print(output)

The replacement includes an ampersand as text, not as a hand-built XML fragment. WolfDocx serializes the supported edit and verifies before saving. Untouched ZIP members retain their compressed bytes and entry metadata. A refused edit should stop the script; ignoring its status and saving anyway is not a fix.

What the diagnostic checks actually establish

check_xml checks ZIP member checksums and parses XML and relationship members before and after the operation. An exception is useful evidence that the file failed a basic integrity check. Passing means only those checks passed. It does not establish schema validity, valid relationship targets, correct field nesting, or acceptance by Microsoft Word. For a real failure, keep the exception and the named package member rather than replacing the broken content with an empty paragraph.

What it does not do

  • It does not repair a damaged source or recover content Word has discarded.
  • It does not prove that every python-docx save is unsafe, or that every accepted DOCX will open without a Word warning.
  • Find and replace is bounded to supported content in one part. Unsupported content can refuse instead of being rewritten.
  • A Python reopen or XML parse is not a Microsoft Word validation run. Review the actual deliverable in its target reader.

Related: replace text without raw XML edits, bounded edits versus python-docx, and migration call mapping.

Get WolfDocx

WolfDocx Community is MIT-licensed and free, including commercial use. It edits existing .docx files in place in pure Python and does not render pages or convert to PDF. WolfDocx Commercial does not change those rights.

pip install wolfdocx

WolfDocx Commercial is an organization-scoped subscription. WolfDocx Community installs from public PyPI with pip install wolfdocx. WolfDocx Commercial installs from the authenticated WolfDocx package index with a per-purchase credential, issued on the checkout success page after payment and reissued through https://wolfxl.com/recover.

Review the scoped before-and-after memo files in the reporting walkthrough, or ask about your document before purchasing if compatibility is uncertain.

See WolfDocx Commercial

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