AttributeError: 'zipimport.zipimporter' object attribute 'load_module' is read-only

[Ch3LL]

Issue

When attempting to import setuptools from an egg in a virtualenv environment I am seeing this error:

>>> import setuptools
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "<frozen importlib._bootstrap>", line 971, in _find_and_load
  File "<frozen importlib._bootstrap>", line 955, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 656, in _load_unlocked
  File "<frozen importlib._bootstrap>", line 626, in _load_backward_compatible
  File "/tmp/test/setuptools-42.0.0/setuptools-42.0.0-py3.6.egg/setuptools/__init__.py", line 20, in <module>
  File "<frozen importlib._bootstrap>", line 971, in _find_and_load
  File "<frozen importlib._bootstrap>", line 951, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 894, in _find_spec
  File "/tmp/salt-tests-tmpdir/tmp8v5ucrk2/psetuptools/lib/python3.6/site-packages/_virtualenv.py", line 64, in find_spec
    setattr(spec.loader, func_name, partial(func, old))
AttributeError: 'zipimport.zipimporter' object attribute 'load_module' is read-only

Steps to reproduce:

1. Create virtualenv and activate virtualenv

 ch3ll@thecakeisalie  /tmp  virtualenv issue-20.0.10
created virtual environment CPython3.7.5.final.0-64 in 103ms
  creator CPython3Posix(dest=/tmp/issue-20.0.10, clear=False, global=False)
  seeder FromAppData(download=False, pip=latest, setuptools=latest, wheel=latest, via=copy, app_data_dir=/home/ch3ll/.local/share/virtualenv/seed-app-data/v1)
  activators BashActivator,CShellActivator,FishActivator,PowerShellActivator,PythonActivator,XonshActivator

 ✘ ch3ll@thecakeisalie  /tmp  source issue-20.0.10/bin/activate
(issue-20.0.10)  ch3ll@thecakeisalie  /tmp  

2. Create an egg build of setuptools.

a) wget https://pypi.io/packages/source/s/setuptools/setuptools-42.0.0.zip
b) unzip setuptools-42.0.0.zip
c) cd setuptools-42.0.0
d) python setup.py -q bdist_egg --dist-dir .

3. Try to import setuptools with egg in sys.path

(issue-20.0.10)  ch3ll@thecakeisalie  /tmp/setuptools-42.0.0  python -c "import sys; sys.path.insert(0, '/tmp/setuptools-42.0.0/setuptools-42.0.0-py3.7.egg'); import setuptools"
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "<frozen importlib._bootstrap>", line 983, in _find_and_load
  File "<frozen importlib._bootstrap>", line 967, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 668, in _load_unlocked
  File "<frozen importlib._bootstrap>", line 638, in _load_backward_compatible
  File "/tmp/setuptools-42.0.0/setuptools-42.0.0-py3.7.egg/setuptools/__init__.py", line 20, in <module>
  File "<frozen importlib._bootstrap>", line 983, in _find_and_load
  File "<frozen importlib._bootstrap>", line 963, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 906, in _find_spec
  File "/tmp/issue-20.0.10/lib/python3.7/site-packages/_virtualenv.py", line 64, in find_spec
    setattr(spec.loader, func_name, partial(func, old))
AttributeError: 'zipimport.zipimporter' object attribute 'load_module' is read-only

And when on virtualenv 16.4.3 it works just fine:

(issue-16.4.3)  ch3ll@thecakeisalie  /tmp  python -c "import sys; sys.path.insert(0, '/tmp/setuptools-42.0.0/setuptools-42.0.0-py3.7.egg'); import setuptools"     
(issue-16.4.3)  ch3ll@thecakeisalie  /tmp  

Environment

Provide at least:

• OS: confirmed on both macosx and manjaro.

 ch3ll@thecakeisalie  ~/git/virtualenv  ➦ 93cf9ed <B>  pip list
DEPRECATION: The default format will switch to columns in the future. You can use --format=(legacy|columns) (or define a format=(legacy|columns) in your pip.conf under the [list] section) to disable this warning.
appdirs (1.4.3)
certifi (2019.11.28)
chardet (3.0.4)
colorlog (3.2.0)
distlib (0.3.0)
filelock (3.0.12)
idna (2.8)
importlib-metadata (1.5.0)
nox-py2 (2019.6.25)
pip (9.0.3)
py (1.8.1)
pyprof2calltree (1.4.4)
pyzmq (18.1.1)
requests (2.23.0)
setuptools (41.2.0)
six (1.14.0)
tornado (4.5.3)
urllib3 (1.25.7)
virtualenv (20.0.10)
zipp (3.1.0)
You are using pip version 9.0.3, however version 20.0.2 is available.
You should consider upgrading via the 'pip install --upgrade pip' command.

[gaborbernat]

I'm pretty sure egg builds are not supported by setuptools, that being said I agree we should not be failing here.

[gaborbernat]

Hello, a fix for this issue has been released via virtualenv 20.0.11; see https://pypi.org/project/virtualenv/20.0.11/ (https://virtualenv.pypa.io/en/latest/changelog.html#v20-0-11-2020-03-18). Please give a try and report back if your issue has not been addressed; if not, please comment here, and we'll reopen the ticket. We want to apologize for the inconvenience this has caused you and say thanks for having patience while we resolve the unexpected bugs with this new major release.