问题描述
Django 3.0.0发行说明指定删除了某些私有的Python 2兼容性API。其中有django.utils.six。
对于此错误，@ WillemVanOnsem特别指出该模块corsheaders正在引用该模块。
对于遇到相同问题的其他人，查看stacktrace的最后一行上的文件路径可以帮助识别有问题的模块。我看到的另一个例子是：
...
File "/path/to/project/venv/lib/python3.8/site-packages/parler/utils/conf.py", line 10, in <module>
from django.utils import six
ImportError: cannot import name 'six' from 'django.utils' (/path/to/project/venv/lib/python3.8/site-packages/django/utils/__init__.py)
在这种情况下，导致问题的模块为parler。希望这对遇到此问题的其他人有所帮助。
解决方法
目前，我已经将Django的版本从升级2.0.6到，3.0并且在调用python manage.py shellcommand时突然出现以下错误：
ImportError: cannot import name 'six' from 'django.utils' (/path-to-project/project/venv/lib/python3.7/site-packages/django/utils/init.py)
完整跟踪：
Traceback (most recent call last):
File "manage.py",line 13,in <module>
execute_from_command_line(sys.argv)
File "/path-to-project/project/venv/lib/python3.7/site-packages/django/core/management/__init__.py",line 401,in execute_from_command_line
utility.execute()
File "/path-to-project/project/venv/lib/python3.7/site-packages/django/core/management/__init__.py",line 377,in execute
django.setup()
File "/path-to-project/project/venv/lib/python3.7/site-packages/django/__init__.py",line 24,in setup
apps.populate(settings.INSTALLED_APPS)
File "/path-to-project/project/venv/lib/python3.7/site-packages/django/apps/registry.py",line 91,in populate
app_config = AppConfig.create(entry)
File "/path-to-project/project/venv/lib/python3.7/site-packages/django/apps/config.py",line 90,in create
module = import_module(entry)
File "/usr/lib/python3.7/importlib/__init__.py",line 127,in import_module
return _bootstrap._gcd_import(name[level:],package,level)
File "<frozen importlib._bootstrap>",line 1006,in _gcd_import
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 677,in _load_unlocked
File "<frozen importlib._bootstrap_external>",line 728,in exec_module
File "<frozen importlib._bootstrap>",line 219,in _call_with_frames_removed
File "/path-to-project/project/venv/lib/python3.7/site-packages/corsheaders/__init__.py",line 1,in <module>
from .checks import check_settings # noqa: F401
File "/path-to-project/project/venv/lib/python3.7/site-packages/corsheaders/checks.py",line 7,in <module>
from django.utils import six