用python写一段可以实现Word文档与PDF文档的格式转化 ，PDF文件的合并、拆分，PDF页面旋转以及PDF页面增加水印。

好的，以下是Python代码，用于实现Word文档与PDF文档的格式转化，PDF文件的合并、拆分，PDF页面旋转以及PDF页面增加水印：

# 导入所需的库
import os
import glob
from PyPDF2 import PdfFileReader, PdfFileWriter
from docx2pdf import convert
from PyPDF2.pdf import PageObject
from PyPDF2.pdf import ContentStream
from PyPDF2.pdf import TextStringObject


# 定义函数，实现Word文档转化为PDF文档
def convert_word_to_pdf(input_file_path, output_file_path):
    convert(input_file_path, output_file_path)

# 定义函数，实现PDF文件拆分
def split_pdf(input_file_path, output_dir_path):
    input_file_name = os.path.basename(input_file_path)
    input_file_name_without_ext = os.path.splitext(input_file_name)[0]

    pdf_reader = PdfFileReader(input_file_path)
    for i in range(pdf_reader.numPages):
        output_pdf_writer = PdfFileWriter()
        output_pdf_file_name = '{}_{}.pdf'.format(input_file_name_without_ext, i+1)
        output_pdf_file_path = os.path.join(output_dir_path, output_pdf_file_name)

        output_pdf_writer.addPage(pdf_reader.getPage(i))
        with open(output_pdf_file_path, 'wb') as out_file:
            output_pdf_writer.write(out_file)

# 定义函数，实现PDF文件合并
def merge_pdf(input_dir_path, output_file_path):
    pdf_file_paths = glob.glob(os.path.join(input_dir_path, '*.pdf'))

    pdf_writer = PdfFileWriter()
    for pdf_file_path in pdf_file_paths:
        pdf_reader = PdfFileReader(pdf_file_path)
        for i in range(pdf_reader.numPages):
            page = pdf_reader.getPage(i)
            pdf_writer.addPage(page)

    with open(output_file_path, 'wb') as out_file:
        pdf_writer.write(out_file)

# 定义函数，实现PDF页面旋转
def rotate_pdf(input_file_path, output_file_path, rotation):
    pdf_reader = PdfFileReader(input_file_path)
    pdf_writer = PdfFileWriter()

    for i in range(pdf_reader.numPages):
        page = pdf_reader.getPage(i)
        page.rotateClockwise(rotation)
        pdf_writer.addPage(page)

    with open(output_file_path, 'wb') as out_file:
        pdf_writer.write(out_file)

# 定义函数，实现PDF页面增加水印
def add_watermark_to_pdf(input_file_path, output_file_path, watermark_text):
    pdf_reader = PdfFileReader(input_file_path)
    pdf_writer = PdfFileWriter()

    for i in range(pdf_reader.numPages):
        page = pdf_reader.getPage(i)
        content_object = ContentStream([TextStringObject(watermark_text), page['/Contents'][0]])
        page[PageObject.CONTENTS] = content_object
        pdf_writer.addPage(page)

    with open(output_file_path, 'wb') as out_file:
        pdf_writer.write(out_file)

# 调用各个函数，实现所需功能
convert_word_to_pdf('/path/to/input.docx', '/path/to/output.pdf')
split_pdf('/path/to/input.pdf', '/path/to/output_dir/')
merge_pdf('/path/to/input_dir/', '/path/to/output.pdf')
rotate_pdf('/path/to/input.pdf', '/path/to/output.pdf', 90)
add_watermark_to_pdf('/path/to/input.pdf', '/path/to/output.pdf', '水印文字')

以上代码中，涉及到的库有：

1. `os`：用于操作文件和路径；
2. `glob`：用于获取匹配指定模式的所有路径；
3. `PyPDF2`：用于操作PDF文件；
4. `docx2pdf`：用于将Word文件转化为PDF文件。

具体实现可以根据具体需求进行调整和修改。