利用Python实现Word文档与PDF文档的格式转化 （提取PDF文本内容），实现PDF文件的合并、拆分，PDF页面旋转已经PDF页面增加水印。

您可以使用Python中的PyPDF2和pdfminer.six库来实现这些功能。

首先，将PDF文件转换为文本，您可以使用pdfminer.six库。这个库可以从PDF文件中提取文本内容。

import io
from pdfminer.converter import TextConverter
from pdfminer.layout import LAParams
from pdfminer.pdfinterp import PDFResourceManager, PDFPageInterpreter
from pdfminer.pdfpage import PDFPage

def convert_pdf_to_txt(path):
    rsrcmgr = PDFResourceManager()
    codec = 'utf-8'
    laparams = LAParams()
    with io.StringIO() as output:
        device = TextConverter(rsrcmgr, output, codec=codec, laparams=laparams)
        with open(path, 'rb') as fp:
            interpreter = PDFPageInterpreter(rsrcmgr, device)
            for page in PDFPage.get_pages(fp):
                interpreter.process_page(page)
        text = output.getvalue()
    return text

要将文本转换为Word文档，您可以使用Python docx库。

import docx

def convert_text_to_docx(text, output_path):
    doc = docx.Document()
    doc.add_paragraph(text)
    doc.save(output_path)

将PDF文件进行合并，您可以使用PyPDF2库。

from PyPDF2 import PdfFileMerger

def merge_pdfs(paths, output_path):
    merger = PdfFileMerger()
    for path in paths:
        merger.append(path)
    merger.write(output_path)

将PDF文件进行拆分，同样可以使用PyPDF2库。

from PyPDF2 import PdfFileReader, PdfFileWriter

def split_pdf(input_path, split_paths):
    with open(input_path, 'rb') as input_file:
        reader = PdfFileReader(input_file)
        for i in range(reader.getNumPages()):
            writer = PdfFileWriter()
            writer.addPage(reader.getPage(i))
            output_path = split_paths.format(i+1)
            with open(output_path, 'wb') as output_file:
                writer.write(output_file)

要将PDF页面旋转，您可以使用PyPDF2库。

from PyPDF2 import PdfFileReader, PdfFileWriter

def rotate_pdf(input_path, output_path, rotation):
    with open(input_path, 'rb') as input_file:
        reader = PdfFileReader(input_file)
        writer = PdfFileWriter()

        for i in range(reader.getNumPages()):
            page = reader.getPage(i)
            page.rotateClockwise(rotation)
            writer.addPage(page)
            
        with open(output_path, 'wb') as output_file:
            writer.write(output_file)

最后，将PDF页面添加水印，您可以使用PyPDF2库。

from PyPDF2 import PdfFileReader, PdfFileWriter
from reportlab.pdfgen import canvas
from io import BytesIO

def add_watermark(input_path, output_path, watermark_text):
    with open(input_path, 'rb') as input_file:
        reader = PdfFileReader(input_file)
        writer = PdfFileWriter()

        watermark_pdf = BytesIO()
        c = canvas.Canvas(watermark_pdf)

        c.drawString(10, 10, watermark_text)
        c.save()

        watermark_pdf.seek(0)

        watermark = PdfFileReader(watermark_pdf)

        for i in range(reader.getNumPages()):
            page = reader.getPage(i)
            page.mergePage(watermark.getPage(0))
            writer.addPage(page)

        with open(output_path, 'wb') as output_file:
            writer.write(output_file)

以上是利用Python实现Word文档与PDF文档的格式转化，实现PDF文件的合并、拆分，PDF页面旋转已经PDF页面增加水印的方法。