New submission from Bart Robinson :
When a ZipFile object is created with mode='a', the existing file contents are
checked for the magic number b"PK\005\006" near the end of the file. If a
non-zipfile just happens to contain this magic number, it can confuse the
library into assuming the file is a zipfile when it is not. It would be great
if ZipFile.__init__() provided a way to skip the magic-number check and force a
new central directory to be appended to the file.
This could take the form of an additional named argument like
ZipFile.__init__(force_append=True), or an additional character in the mode
string, like 'a+'. Either of these options should be backward-compatible with
existing code.
Currently, my company has code that uses monkey-patching to work around the
lack of this feature in the standard library. We use mode='a' to append
metadata to files in existing formats that can contain arbitrary binary data
and so occasionally include the magic number.
--
components: Library (Lib)
messages: 382691
nosy: Bart Robinson
priority: normal
severity: normal
status: open
title: Provide a way to skip magic-number search in ZipFile(mode='a')
type: enhancement
versions: Python 3.10
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<https://bugs.python.org/issue42594>
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