Cannot import modules from Zip64 files

[luisffranca]

BPO	45576
Nosy	@luisffranca

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2021-10-22.16:40:33.579>
labels = ['type-bug', 'library', '3.9']
title = 'Cannot import modules from Zip64 files'
updated_at = <Date 2021-10-22.16:40:33.579>
user = 'https://github.com/luisffranca'

bugs.python.org fields:

activity = <Date 2021-10-22.16:40:33.579>
actor = 'lfamorim'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2021-10-22.16:40:33.579>
creator = 'lfamorim'
dependencies = []
files = []
hgrepos = []
issue_num = 45576
keywords = []
message_count = 1.0
messages = ['404792']
nosy_count = 1.0
nosy_names = ['lfamorim']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue45576'
versions = ['Python 3.9']

Linked PRs

• gh-89739: gh-77140: Support zip64 in zipimport #94146

[luisffranca]

I've tried to import a module from a fat jar file and got a ModuleNotFoundError: No module named ... error.

I checked that the jar file had more than 65k files and was created using Zip64. When I unzip the file, Python is capable of importing the modules.

I was able to reproduce the error on a simple project, such as:

simplePackage/
__init__.py
a/
__init__.py
moduleA.py

where

• I'm using Python 3.9.4
• __init__.py files are empty
• moduleA.py only has a printA() function

I ran the following tests:

1. When importing from the folder, it works

python
>>> import sys
>>> sys.path.append('C:\\Users\\...\\simplePackage')
>>> from a.moduleA import printA
>>> printA()
I'm module a

2. When zipping the folder, it works

python
>>> import sys
>>> sys.path.append('C:\\Users\\...\\simplePackage.zip')
>>> from a.moduleA import printA
>>> printA()
I'm module a

3. When forcing to zip with Zip64 it doesn't work

On linux: zip -fzr simple64Package.zip .

python
>>> import sys
>>> sys.path.append('C:\\Users\\...\\simple64Package.zip')
>>> from a.moduleA import printA
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ModuleNotFoundError: No module named 'a'

Is this an expected behavior? Am I missing something?

Thanks!