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。

可以使用Python的第三方库PyPDF2来实现PDF文件的合并、拆分、页面旋转和增加水印。而要实现Word文档到PDF文档的格式转化，则需使用Python的另外一个第三方库python-docx和PyPDF2结合起来实现。

以下是实现PDF文件操作和Word文档到PDF转化的Python代码示例：

# 导入所需的库
import os
import PyPDF2
import docx2pdf

# PDF文件合并
def merge_pdf(pdf_list, output_name):
    pdf_writer = PyPDF2.PdfFileWriter()
    for pdf_file in pdf_list:
        with open(pdf_file, 'rb') as pdf:
            pdf_reader = PyPDF2.PdfFileReader(pdf)
            for page in range(pdf_reader.getNumPages()):
                pdf_writer.addPage(pdf_reader.getPage(page))
    with open(output_name, 'wb') as output_file:
        pdf_writer.write(output_file)

# PDF文件拆分
def split_pdf(pdf_file, output_dir):
    with open(pdf_file, 'rb') as pdf:
        pdf_reader = PyPDF2.PdfFileReader(pdf)
        for page in range(pdf_reader.getNumPages()):
            pdf_writer = PyPDF2.PdfFileWriter()
            pdf_writer.addPage(pdf_reader.getPage(page))
            output_file = os.path.join(output_dir, f'{os.path.basename(pdf_file)[:-4]}_{page+1}.pdf')
            with open(output_file, 'wb') as output:
                pdf_writer.write(output)

# PDF页面旋转
def rotate_pdf(pdf_file, output_name, rotation):
    with open(pdf_file, 'rb') as pdf:
        pdf_reader = PyPDF2.PdfFileReader(pdf)
        pdf_writer = PyPDF2.PdfFileWriter()
        for page in range(pdf_reader.getNumPages()):
            pdf_page = pdf_reader.getPage(page)
            pdf_page.rotateCounterClockwise(rotation)
            pdf_writer.addPage(pdf_page)
    with open(output_name, 'wb') as output_file:
        pdf_writer.write(output_file)

# PDF文件增加水印
def add_watermark(pdf_file, watermark_file, output_name):
    with open(pdf_file, 'rb') as pdf:
        pdf_reader = PyPDF2.PdfFileReader(pdf)
        with open(watermark_file, 'rb') as watermark:
            watermark_reader = PyPDF2.PdfFileReader(watermark)
            watermark_page = watermark_reader.getPage(0)
            pdf_writer = PyPDF2.PdfFileWriter()
            for page in range(pdf_reader.getNumPages()):
                pdf_page = pdf_reader.getPage(page)
                pdf_page.mergePage(watermark_page)
                pdf_writer.addPage(pdf_page)
    with open(output_name, 'wb') as output_file:
        pdf_writer.write(output_file)

# Word文档转PDF
def word_to_pdf(input_file, output_file):
    docx2pdf.convert(input_file, output_file)

使用这些函数，你就可以实现Word文档到PDF文档的转化，以及对PDF文件的合并，拆分，页面旋转和增加水印的操作。