ZipFile' 对象没有属性 'seek'

Question

我正在尝试让一个可以制作 ePub 文件的脚本正常工作。它们是压缩的 zip 文件，已放气（即未压缩）并且必须按顺序完成。此当前脚本将创建一个 .zip，但它无法使用，当运行 zip -t 命令时，它会在 Python Shell 和终端应用程序中创建错误。

问题中的错误如下Python shell:

Traceback (most recent call last):
  File "/Users/Hal/Documents/GitHub/Damore-essay-ebook/GenEpub-old.py", line 29, in <module>
    if zipfile.is_zipfile(zf) is True:
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/zipfile.py", line 183, in is_zipfile
    result = _check_zipfile(fp=filename)
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/zipfile.py", line 169, in _check_zipfile
    if _EndRecData(fp):
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/zipfile.py", line 241, in _EndRecData
    fpin.seek(0, 2)
AttributeError: 'ZipFile' object has no attribute 'seek'

Mac 终端上的问题错误（尽管我确信在运行 zip -t:

的任何地方输出都是一样的

Archive:  IdealogicalEcho.epub
  End-of-central-directory signature not found.  Either this file is not
  a zipfile, or it constitutes one disk of a multi-part archive.  In the
  latter case the central directory and zipfile comment will be found on
  the last disk(s) of this archive.
unzip:  cannot find zipfile directory in one of IdealogicalEcho.epub or
        IdealogicalEcho.epub.zip, and cannot find IdealogicalEcho.epub.ZIP, period.

Python源代码：

#!/usr/bin/env python

#GenEpub.py - Generates an .epub file from the data provided.
#Ideally with no errors or warnings from epubcheck (needs to be implemented, maybe with the Python wrapper).

import os
import json
import zipfile
    
with open('metadata.json') as json_file:
        data = json.load(json_file)

#The ePub standard requires deflated compression and a compression order.
zf = zipfile.ZipFile(data["fileName"] + '.epub', mode='w', compression=zipfile.ZIP_STORED)

zf.write(data["fileName"] + '/mimetype')

for dirname, subdirs, files in os.walk(data["fileName"] + '/META-INF'):
    zf.write(dirname)
    for filename in files:
        zf.write(os.path.join(dirname, filename))

for dirname, subdirs, files in os.walk(data["fileName"] + '/EBOOK'):
    zf.write(dirname)
    for filename in files:
        zf.write(os.path.join(dirname, filename))

#zipfile has a built-in validator for debugging
if zipfile.is_zipfile(zf) is True:
    print("ZIP file is valid.")

#Extra debugging information
#print(getinfo.compress_type(zf))
#print(getinfo.compress_size(zf))
#print(getinfo.file_size(zf))

zf.close()

JSON 我使用的文件：

{
        "comment1": "Metadata.json - Insert the e-book's metadata here. WIP",

        "comment2": "Technical metadata - This is the where the cover image is specified. Recommended to use ePub V2.0.1 over 3.0 for epubVersion and Reflowable rather than Fixed for textPresentation (unless doing a project that requires a specific layout). mobiCover and generateKindle are currently unused but added for futureproofing.",
        "epubCover": "cover.jpg",
        "mobiCover": "cover.jpg",
        "fileName": "IdealogicalEcho",
        "epubVersion": "2.0.1",
        "textPresentation": "Reflowable",
        "generateKindle": "no",

        "comment3": "Book metadata - Information about the e-book itself. Language is specified with ISO 639-1. Rights can be worldwide, country specific or under a permissable license such as Creative-Commons SA",
        "title": "Google's Idealogical Echochamber",
        "creator": "James Damore",
        "subject": "Academic",
        "publisher": "Hal Motley",
        "ISBN": "-",
        "language": "en",
        "rights": "Creative-Commons SA",

        "comment4": "This is the page order that the e-book has. The first number before the colon is the page order, the second is the indentation, third is the page name and fourth is file itself.",
            "pages": [
                    {
                        "1": [0, "Cover", "bookcover.xhtml"],
                        "2": [0, "Title", "title.xhtml"],
                        "3": [0, "Indicia", "indicia.xhtml"],
                        "4": [0, "License", "license.xhtml"],
                        "5": [0, "Contents", "toc.xhtml"],
                        "6": [0, "Foreword", "foreword.xhtml"],
                        "7": [0, "Article", "article.xhtml"]
                    }
                            ]
}

Answer 1

我建议您尝试在验证之前关闭。对仍处于写入状态的文件执行整个文件操作可能无法给出有效结果。

Answer 2

问题出在 is_zipfile 的某个地方。尽管“文件名 可能是一个文件或类似文件的对象”（13.5.1. ZipFile Objects: zipfile.is_zipfile）仍然存在，但它因 seek 错误而失败。

一个可能的解决方案是关闭文件并重新打开它只是为了检查：

zf.close()

with open(data["fileName"] + '.epub','r') as f:
    if zipfile.is_zipfile(f) is True:
        print("ZIP file is valid.")

我还发现该检查非常基本，并且 return True 即使您手动损坏了一些字节。真正让它失败需要一些努力。

有趣的是，明显更彻底的 zipfile.ZipFile.testzip 函数需要再次 zf——但如果在 zf.close() 之前调用它也会失败。而且没有zf.flush() ...

幸运的是，在运行之后用 zip 检查创建的 ePub 文件，脚本显示它没有错误：

~/Documents $ zip -T IdealogicalEcho.epub 
test of IdealogicalEcho.epub OK

（not 告诉你，顺便说一下，它是一个有效的 epub。（它不是。））

ZipFile' 对象没有属性 'seek'

ZipFile' object has no attribute 'seek'

python

json

seek

epub

python-zipfile