python-pptx无法从某些Powerpoint演示文稿中提取文本，但其他文件可以正常工作

Question

[尝试从.pptx文件的大目录中提取文本字段，以下脚本非常适合某些Powerpoint演示文稿：

from pptx import Presentation
import glob

f = open("Scraped PPTX Data.txt", "a", encoding='utf-8')
for eachfile in glob.glob("*.pptx"):
    prs = Presentation(eachfile)
    for slide in prs.slides:
        for shape in slide.shapes:
            if hasattr(shape, "text"):
                f.write(shape.text)

f.close()

然而，在许多其他人（看来是非常大的人）上，我收到了这道巨大的错误墙：

  File "C:\Users\GLD-POS3\Desktop\SIGNS\PPT_Scraper.py", line 9, in <module>
    prs = Presentation(eachfile)
  File "C:\Users\GLD-POS3\AppData\Local\Programs\Python\Python37-32\lib\site-packages\pptx\api.py", line 28, in Presentation
    presentation_part = Package.open(pptx).main_document_part
  File "C:\Users\GLD-POS3\AppData\Local\Programs\Python\Python37-32\lib\site-packages\pptx\opc\package.py", line 125, in open
    pkg_reader = PackageReader.from_file(pkg_file)
  File "C:\Users\GLD-POS3\AppData\Local\Programs\Python\Python37-32\lib\site-packages\pptx\opc\pkgreader.py", line 37, in from_file
    phys_reader, pkg_srels, content_types
  File "C:\Users\GLD-POS3\AppData\Local\Programs\Python\Python37-32\lib\site-packages\pptx\opc\pkgreader.py", line 70, in _load_serialized_parts
    for partname, blob, srels in part_walker:
  File "C:\Users\GLD-POS3\AppData\Local\Programs\Python\Python37-32\lib\site-packages\pptx\opc\pkgreader.py", line 106, in _walk_phys_parts
    phys_reader, part_srels, visited_partnames
  File "C:\Users\GLD-POS3\AppData\Local\Programs\Python\Python37-32\lib\site-packages\pptx\opc\pkgreader.py", line 106, in _walk_phys_parts
    phys_reader, part_srels, visited_partnames
  File "C:\Users\GLD-POS3\AppData\Local\Programs\Python\Python37-32\lib\site-packages\pptx\opc\pkgreader.py", line 103, in _walk_phys_parts
    blob = phys_reader.blob_for(partname)
  File "C:\Users\GLD-POS3\AppData\Local\Programs\Python\Python37-32\lib\site-packages\pptx\opc\phys_pkg.py", line 111, in blob_for
    return self._zipf.read(pack_uri.membername)
  File "C:\Users\GLD-POS3\AppData\Local\Programs\Python\Python37-32\lib\zipfile.py", line 1432, in read
    return fp.read()
  File "C:\Users\GLD-POS3\AppData\Local\Programs\Python\Python37-32\lib\zipfile.py", line 885, in read
    buf += self._read1(self.MAX_N)
  File "C:\Users\GLD-POS3\AppData\Local\Programs\Python\Python37-32\lib\zipfile.py", line 989, in _read1
    self._update_crc(data)
      File "C:\Users\GLD-POS3\AppData\Local\Programs\Python\Python37-32\lib\zipfile.py", line 917, in  _update_crc
raise BadZipFile("Bad CRC-32 for file %r" % self.name)
zipfile.BadZipFile: Bad CRC-32 for file 'ppt/media/image170.jpeg'

Answer 1

文件'ppt / media / image170.jpeg'的CRC-32错误

这里要知道的是，pptx文件基本上只是一个带有花哨名称的zip文件。

尝试运行python -m zipfile -l filename.pptx那应该列出pptx文件的内容。通常，pptx文件包含一堆xml文件，一堆图像和其他媒体文件。

从错误消息中，您可以看到为cyclic redundancy check计算的校验和（CRC = image170.jpeg）与zipfile中存储的值不匹配。

[AFAICT，无法告诉ZipFile忽略CRC错误。

事实是，提取文本时，您可能只需要读取zip文件内ppt/slides/slideN.xml文件夹中的XML文件。您完全不需要访问图像。

尝试使用zipfile.ZipFile打开无效文件，然后从ppt/slides中的XML文件中手动提取文本。