场景

有这样一个需求：复制一个DOCX的文档内容到目标文档末尾，其中包括段落、图片、表格等，并且保持目标文档的样式（页边距、页眉页尾等）

调研

查找了一些资料后，主要有这么几个方向：调用Office、WPS、LibreOffice的Word Application完成合并功能、引入第三方库（实际底层可能也是用的前一种方法）

方案

我这里使用的是标准库 python-docx

from docx import Document
from docx.text.paragraph import Paragraph
from docx.oxml import CT_P, CT_Tbl
from docx.table import _Cell, Table
from docx.document import Document as _Document


def append_doc_to_another(main_doc: Document, doc_to_append_path: str):
    """
    Merge the contents of multiple Word documents

    :param main_doc: Document
    :param doc_to_append_path: path str
    :return: Document
    """
    source_doc = Document(doc_to_append_path)
    
    for block in iter_block_items(source_doc):
        if isinstance(block, Paragraph):
            main_doc.element.body.append(block._element)
        elif isinstance(block, Table):
            main_doc.element.body.append(block._tbl)
        else:
            raise Exception(f"Unexpected type: {type(block)}")

    return main_doc


def iter_block_items(parent):
    """
    Yield each block item child of *parent*, in document order.
    Each item will be an instance of either Table or Paragraph.
    """
    if isinstance(parent, _Document):
        parent_elm = parent.element.body
    elif isinstance(parent, _Cell):
        parent_elm = parent._tc
    else:
        raise ValueError("Unexpected block!")

    for child in parent_elm.iterchildren():
        if isinstance(child, CT_P):
            yield Paragraph(child, parent)
        elif isinstance(child, CT_Tbl):
            yield Table(child, parent)