ImportError: cannot import name _remove_dead_weakref in django virtualenv

Question

将我的 Ubuntu 桌面从 16.04 升级到 18.04 后，django 的 virtualenv 拒绝启动：

(.djangoenv) mw@desktop:~/theapp$ python manage.py runserver
Traceback (most recent call last):
  File "manage.py", line 8, in <module>
    from django.core.management import execute_from_command_line
  File "/home/mw/.djangoenv/local/lib/python2.7/site-packages/django/core/management/__init__.py", line 10, in <module>
    from django.apps import apps
  File "/home/mw/.djangoenv/local/lib/python2.7/site-packages/django/apps/__init__.py", line 1, in <module>
    from .config import AppConfig   # NOQA
  File "/home/mw/.djangoenv/local/lib/python2.7/site-packages/django/apps/config.py", line 4, in <module>
    from django.core.exceptions import AppRegistryNotReady, ImproperlyConfigured
  File "/home/mw/.djangoenv/local/lib/python2.7/site-packages/django/core/exceptions.py", line 5, in <module>
    from django.utils.encoding import force_text
  File "/home/mw/.djangoenv/local/lib/python2.7/site-packages/django/utils/encoding.py", line 10, in <module>
    from django.utils.functional import Promise
  File "/home/mw/.djangoenv/local/lib/python2.7/site-packages/django/utils/functional.py", line 1, in <module>
    import copy
  File "/usr/lib/python2.7/copy.py", line 52, in <module>
    import weakref
  File "/usr/lib/python2.7/weakref.py", line 14, in <module>
    from _weakref import (
ImportError: cannot import name _remove_dead_weakref

在 djangoenv 上和

外

$ python --version : 
`Python 2.7.12`

希望能解决这个问题，我也在桌面上安装了Python 2.7.16，所以我得到：

$ python2.7 --version
Python 2.7.16

另外，当我尝试安装新的 virtualenv 时，我得到同样的错误：

$ virtualenv .blaenv
Running virtualenv with interpreter /home/mw/.djangoenv/bin/python2
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/virtualenv.py", line 21, in <module>
    import logging
  File "/usr/lib/python2.7/logging/__init__.py", line 26, in <module>
    import sys, os, time, cStringIO, traceback, warnings, weakref, collections
  File "/usr/lib/python2.7/weakref.py", line 14, in <module>
    from _weakref import (
ImportError: cannot import name _remove_dead_weakref

在其他情况下对相同错误的回答没有帮助，我的搜索没有找到更多线索。非常感谢您的提示。

Answer 1

根据 https://askubuntu.com/questions/981663/python2-7-broken-by-weakref-import-error-please-help，您可能需要重新创建 virtualenv。我怀疑你的问题是你需要 deactivate 在尝试创建新环境之前你当前的环境，以确保你的系统 python2 解释器是那个运行 virtualenv命令。

ImportError: cannot import name _remove_dead_weakref in django virtualenv

ImportError: cannot import name _remove_dead_weakref in django virtualenv

django

virtualenv

python-2.7