Django 2.1 和 Python 3.7: KeyError: 'django' when running Apache2 mod_wsgi 和其他问题

Question

经过这么多小时试图弄清楚为什么我的 django 设置不再工作，我来找你。无论你想要什么，我都向上帝发誓，因为它，我昨晚没有睡觉。

我想从 Python 3.5 切换到 Python 3.7，因为我开始使用 f-strings，而且由于 Python 3.6 提供了此功能，所以我想为什么不直接使用 Python 3.7。另外，我希望我的 2 个域（mywebsite.fr 和 mywebsite.com）指向同一个 django 项目。到目前为止，只有 mywebsite.fr 没有问题。

我会尽可能准确地向你解释我做了什么来获得下面这个可怕的代码：

• 我的安装是在 Ubuntu 16.04 上，
• 我在我的 Ubuntu 设置上原生安装的 Python 版本搞砸了。我终于成功地正确安装了（我认为）Python 3.7，
• 我真的很难配置/制作/安装适当的 mod_wsgi，
• 我将 venv 用于我的 django 设置（下面称为 m2gvenvprod），
• 我正在使用 mod_wgsi 及其相关的守护进程模式，
• 根据我阅读的所有内容，我确信我在 apache2 中对每个网站/域的配置都是正确的（在可用站点中），
• 我在这里，在尝试了我在互联网上找到的关于我的问题的所有内容的任意组合之后，使用下面的 apache2 error.log。我无法理解该日志。我不明白为什么 django 不是有效的密钥。我现在什么都不知道……真的很绝望。

我注意到一件事可能很有趣：如果我访问 mywebsite.com：错误 500。但如果我访问 mywebsite.com/admin，我会被重定向到 mywebsite.com/admin/login/?next=/admin/ : 所以，肯定有什么东西还在工作，嗯？

Traceback (most recent call last):
  File "/home/krazymax/django/M2Gproject/m2gvenvprod/lib/python3.7/site-packages/django/template/utils.py", line 66, in __getitem__
    return self._engines[alias]
KeyError: 'django'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/krazymax/django/M2Gproject/m2gvenvprod/lib/python3.7/site-packages/django/template/backends/django.py", line 121, in get_package_libraries
    module = import_module(entry[1])
  File "/usr/local/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 "/home/krazymax/django/M2Gproject/m2gvenvprod/lib/python3.7/site-packages/django_libs/templatetags/libs_tags.py", line 6, in <module>
    from django.template.base import TOKEN_BLOCK, TOKEN_VAR
ImportError: cannot import name 'TOKEN_BLOCK' from 'django.template.base' (/home/krazymax/django/M2Gproject/m2gvenvprod/lib/python3.7/site-packages/django/template/base.py)

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/krazymax/django/M2Gproject/m2gvenvprod/lib/python3.7/site-packages/django/core/handlers/exception.py", line 34, in inner
    response = get_response(request)
  File "/home/krazymax/django/M2Gproject/m2gvenvprod/lib/python3.7/site-packages/django/core/handlers/base.py", line 156, in _get_response
    response = self.process_exception_by_middleware(e, request)
  File "/home/krazymax/django/M2Gproject/m2gvenvprod/lib/python3.7/site-packages/django/core/handlers/base.py", line 154, in _get_response
    response = response.render()
  File "/home/krazymax/django/M2Gproject/m2gvenvprod/lib/python3.7/site-packages/django/template/response.py", line 106, in render
    self.content = self.rendered_content
  File "/home/krazymax/django/M2Gproject/m2gvenvprod/lib/python3.7/site-packages/django/template/response.py", line 81, in rendered_content
    template = self.resolve_template(self.template_name)
  File "/home/krazymax/django/M2Gproject/m2gvenvprod/lib/python3.7/site-packages/django/template/response.py", line 63, in resolve_template
    return select_template(template, using=self.using)
  File "/home/krazymax/django/M2Gproject/m2gvenvprod/lib/python3.7/site-packages/django/template/loader.py", line 38, in select_template
    engines = _engine_list(using)
  File "/home/krazymax/django/M2Gproject/m2gvenvprod/lib/python3.7/site-packages/django/template/loader.py", line 66, in _engine_list
    return engines.all() if using is None else [engines[using]]
  File "/home/krazymax/django/M2Gproject/m2gvenvprod/lib/python3.7/site-packages/django/template/utils.py", line 90, in all
    return [self[alias] for alias in self]
  File "/home/krazymax/django/M2Gproject/m2gvenvprod/lib/python3.7/site-packages/django/template/utils.py", line 90, in <listcomp>
    return [self[alias] for alias in self]
  File "/home/krazymax/django/M2Gproject/m2gvenvprod/lib/python3.7/site-packages/django/template/utils.py", line 81, in __getitem__
    engine = engine_cls(params)
  File "/home/krazymax/django/M2Gproject/m2gvenvprod/lib/python3.7/site-packages/django/template/backends/django.py", line 25, in __init__
    options['libraries'] = self.get_templatetag_libraries(libraries)
  File "/home/krazymax/django/M2Gproject/m2gvenvprod/lib/python3.7/site-packages/django/template/backends/django.py", line 43, in get_templatetag_libraries
    libraries = get_installed_libraries()
  File "/home/krazymax/django/M2Gproject/m2gvenvprod/lib/python3.7/site-packages/django/template/backends/django.py", line 108, in get_installed_libraries
    for name in get_package_libraries(pkg):
  File "/home/krazymax/django/M2Gproject/m2gvenvprod/lib/python3.7/site-packages/django/template/backends/django.py", line 125, in get_package_libraries
    "trying to load '%s': %s" % (entry[1], e)
django.template.library.InvalidTemplateLibrary: Invalid template library specified. ImportError raised when trying to load 'django_libs.templatetags.libs_tags': cannot import name 'TOKEN_BLOCK' from 'django.template.base' (/home/krazymax/django/M2Gproject/m2gvenvprod/lib/python3.7/site-packages/django/template/base.py)

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/krazymax/django/M2Gproject/m2gvenvprod/lib/python3.7/site-packages/django/template/utils.py", line 66, in __getitem__
    return self._engines[alias]
KeyError: 'django'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/krazymax/django/M2Gproject/m2gvenvprod/lib/python3.7/site-packages/django/template/backends/django.py", line 121, in get_package_libraries
    module = import_module(entry[1])
  File "/usr/local/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 "/home/krazymax/django/M2Gproject/m2gvenvprod/lib/python3.7/site-packages/django_libs/templatetags/libs_tags.py", line 6, in <module>
    from django.template.base import TOKEN_BLOCK, TOKEN_VAR
ImportError: cannot import name 'TOKEN_BLOCK' from 'django.template.base' (/home/krazymax/django/M2Gproject/m2gvenvprod/lib/python3.7/site-packages/django/template/base.py)

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/krazymax/django/M2Gproject/m2gvenvprod/lib/python3.7/site-packages/django/core/handlers/exception.py", line 34, in inner
    response = get_response(request)
  File "/home/krazymax/django/M2Gproject/m2gvenvprod/lib/python3.7/site-packages/django/utils/deprecation.py", line 91, in __call__
    response = response or self.get_response(request)
  File "/home/krazymax/django/M2Gproject/m2gvenvprod/lib/python3.7/site-packages/django/core/handlers/exception.py", line 36, in inner
    response = response_for_exception(request, exc)
  File "/home/krazymax/django/M2Gproject/m2gvenvprod/lib/python3.7/site-packages/django/core/handlers/exception.py", line 90, in response_for_exception
    response = handle_uncaught_exception(request, get_resolver(get_urlconf()), sys.exc_info())
  File "/home/krazymax/django/M2Gproject/m2gvenvprod/lib/python3.7/site-packages/django/core/handlers/exception.py", line 129, in handle_uncaught_exception
    return callback(request, **param_dict)
  File "/home/krazymax/django/M2Gproject/m2gvenvprod/lib/python3.7/site-packages/django/utils/decorators.py", line 142, in _wrapped_view
    response = view_func(request, *args, **kwargs)
  File "/home/krazymax/django/M2Gproject/m2gvenvprod/lib/python3.7/site-packages/django/views/defaults.py", line 69, in server_error
    template = loader.get_template(template_name)
  File "/home/krazymax/django/M2Gproject/m2gvenvprod/lib/python3.7/site-packages/django/template/loader.py", line 12, in get_template
    engines = _engine_list(using)
  File "/home/krazymax/django/M2Gproject/m2gvenvprod/lib/python3.7/site-packages/django/template/loader.py", line 66, in _engine_list
    return engines.all() if using is None else [engines[using]]
  File "/home/krazymax/django/M2Gproject/m2gvenvprod/lib/python3.7/site-packages/django/template/utils.py", line 90, in all
    return [self[alias] for alias in self]
  File "/home/krazymax/django/M2Gproject/m2gvenvprod/lib/python3.7/site-packages/django/template/utils.py", line 90, in <listcomp>
    return [self[alias] for alias in self]
  File "/home/krazymax/django/M2Gproject/m2gvenvprod/lib/python3.7/site-packages/django/template/utils.py", line 81, in __getitem__
    engine = engine_cls(params)
  File "/home/krazymax/django/M2Gproject/m2gvenvprod/lib/python3.7/site-packages/django/template/backends/django.py", line 25, in __init__
    options['libraries'] = self.get_templatetag_libraries(libraries)
  File "/home/krazymax/django/M2Gproject/m2gvenvprod/lib/python3.7/site-packages/django/template/backends/django.py", line 43, in get_templatetag_libraries
    libraries = get_installed_libraries()
  File "/home/krazymax/django/M2Gproject/m2gvenvprod/lib/python3.7/site-packages/django/template/backends/django.py", line 108, in get_installed_libraries
    for name in get_package_libraries(pkg):
  File "/home/krazymax/django/M2Gproject/m2gvenvprod/lib/python3.7/site-packages/django/template/backends/django.py", line 125, in get_package_libraries
    "trying to load '%s': %s" % (entry[1], e)
django.template.library.InvalidTemplateLibrary: Invalid template library specified. ImportError raised when trying to load 'django_libs.templatetags.libs_tags': cannot import name 'TOKEN_BLOCK' from 'django.template.base' (/home/krazymax/django/M2Gproject/m2gvenvprod/lib/python3.7/site-packages/django/template/base.py)

提前感谢您提供的建议！

---

编辑 1

现在它根本不工作。我试图让它像以前一样在 Python 3.5 上运行，但没有成功。

Answer 1

好吧，我从没想过 Django (2.1) 的正式版本会成为问题，但我们来了！在python 3.7下创建我的新虚拟环境时，我没有立即关注新版本的django。即使在之后，我认为它是一个稳定的版本，就是这样。所以也许我的 Ubuntu 安装出了点问题（但我真的看不到什么），但是从 django 2.1 降级到 django 2.0 刚刚解决了我的问题！即使我在上面花了太多时间也很高兴。请注意，它适用于 Python 3.7（就像我最初的愿望一样）。

感谢阅读！

Answer 2

我在使用apache 和python 3.7.0. 时也遇到了麻烦

幸运的是，django 2.1.4 与 python 3.6.6. 结合使用时可以正常工作