关于批量提取ppt中文本输出的问题

想批量提取pptx的文本到一个txt文件中怎么办
from pptx import Presentation
import os
for dirpath, dirnames, filenames in os.walk('D:\新建文件夹 (5)'):
for filename in filenames:

      prs = Presentation(dirpath+'/'+filename)




      text_runs = []

      for slide in prs.slides:
          for shape in slide.shapes:
              if not shape.has_text_frame:
                  continue
              for paragraph in shape.text_frame.paragraphs:
                  for run in paragraph.runs:
                      text_runs.append(run.text)


                                 

with open('2.txt', 'w',encoding='utf-8') as f:
f.write('\n'.join(text_runs))

这样好像只能写一个文件我该加什么，之前看到别人发过一个视频教程，但讲到一半后面没了。。
有没有人救一救

with open('2.txt', 'a',encoding='utf-8') as f:
f.write('\n'.join(text_runs))

把写入方式改成“a”，然后这两句放进for循环试试

text_runs = []
 
for slide in prs.slides:
    for shape in slide.shapes:
        if not shape.has_text_frame:
            continue
        for paragraph in shape.text_frame.paragraphs:
            for run in paragraph.runs:
                text_runs.append(run.text)

with open('2.txt', 'a',encoding='utf-8') as f:
    f.write('\n'.join(text_runs))