Python-ZipFile'对象没有属性'seek' [英] Python - ZipFile' object has no attribute 'seek'
问题描述
我的代码在这里遇到了问题.我正在尝试使脚本可以生成ePub文件.它们是压缩的zip文件，这些文件已放气(即未压缩)，必须按顺序进行.当前的脚本将创建一个.zip文件，但它不可用，并且在运行zip -t命令时会在Python Shell和终端应用程序中创建错误.
got a problem with my code here. I am trying to get a script working that can make an ePub file. They are compressed zip files that are deflated (i.e. without compression) and have to be done in order. This current script will create a .zip but it is unusable a creates errors both in Python Shell and on the Terminal app when running the zip -t command.
有问题的错误在Python shell上如下所示:
The error in question is as follows on the 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终端上有问题的错误(尽管我确信无论我在何处运行zip -t，输出都是相同的:
The error in question on the Mac Terminal (though I am sure the output would the same wherever I ran zip -t:
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:
Python source code:
#!/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()
我使用的JSON文件:
JSON file I used:
{
"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"]
}
]
}
推荐答案
问题出在is_zipfile内部.尽管"文件名可以是文件或类似文件的对象"的说法仍然存在(
The problem lies somewhere inside is_zipfile. Although it is stayed that "filename may be a file or file-like object" (13.5.1. ZipFile Objects: zipfile.is_zipfile), it fails with the seek error.
可能的解决方案是关闭文件然后重新打开以检查:
A possible solution is to close the file and reopen it just to check:
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础，即使您手动损坏了一些字节也将返回True.需要花费一些努力才能使其真正失败.
I also found that that check is extremely basic and will return True even if you manually damage some bytes. It takes some effort to actually make it fail.
有趣的是，显然更全面的zipfile.ZipFile.testzip函数再次需要zf –但是，如果在zf.close()之前调用，它也会失败.而且没有zf.flush() ...
Interestingly, the apparent more thorough zipfile.ZipFile.testzip function needs that zf again – but it also fails if called before zf.close(). And there is no zf.flush() ...
幸运的是，在运行脚本后使用zip检查创建的ePub文件显示该文件不包含错误:
Luckily, checking the created ePub file with zip after running the script reveals it contains no errors:
~/Documents $ zip -T IdealogicalEcho.epub
test of IdealogicalEcho.epub OK
(顺便说一句， not 不会告诉您这是有效的 epub .(不是.))
(which does not tell you, by the way, that it is a valid epub. (It is not.))
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