Django2.1.7 ImportError: cannot import name 'util' from 'django.forms' (/Users/lib/python3.7/site-packages/django/forms/init.py)

Question

在从 Django1.5 迁移到 Django2.1.7 的过程中，我们在尝试启动服务器时遇到库函数中的隐式导入错误。

Traceback (most recent call last):
Unhandled exception in thread started by <function check_errors.<locals>.wrapper at 0x10945f950>
Traceback (most recent call last):
  File "/Users/MAK/Envs/lifemed3/lib/python3.7/site-packages/django/utils/autoreload.py", line 225, in wrapper
    fn(*args, **kwargs)
  File "/Users/MAK/Envs/lifemed3/lib/python3.7/site-packages/django/core/management/commands/runserver.py", line 109, in inner_run
    autoreload.raise_last_exception()
  File "/Users/MAK/Envs/lifemed3/lib/python3.7/site-packages/django/utils/autoreload.py", line 248, in raise_last_exception
    raise _exception[1]
  File "/Users/MAK/Envs/lifemed3/lib/python3.7/site-packages/django/core/management/__init__.py", line 337, in execute
    autoreload.check_errors(django.setup)()
  File "/Users/MAK/Envs/lifemed3/lib/python3.7/site-packages/django/utils/autoreload.py", line 225, in wrapper
    fn(*args, **kwargs)
  File "/Users/MAK/Envs/lifemed3/lib/python3.7/site-packages/django/__init__.py", line 24, in setup
    apps.populate(settings.INSTALLED_APPS)
  File "/Users/MAK/Envs/lifemed3/lib/python3.7/site-packages/django/apps/registry.py", line 89, in populate
    app_config = AppConfig.create(entry)
  File "/Users/MAK/Envs/lifemed3/lib/python3.7/site-packages/django/apps/config.py", line 90, in create
    module = import_module(entry)
  File "/Users/MAK/Envs/lifemed3/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 "/Users/MAK/Envs/lifemed3/lib/python3.7/site-packages/json_field/__init__.py", line 1, in <module>
    from json_field.fields import JSONField
  File "/Users/MAK/Envs/lifemed3/lib/python3.7/site-packages/json_field/fields.py", line 4, in <module>
    from json_field.forms import JSONFormField
  File "/Users/MAK/Envs/lifemed3/lib/python3.7/site-packages/json_field/forms.py", line 5, in <module>
    from django.forms import fields, util
ImportError: cannot import name 'util' from 'django.forms' (/Users/MAK/Envs/lifemed3/lib/python3.7/site-packages/django/forms/__init__.py)

我们已经检查了这个answer关于循环依赖的问题，但是因为它是在代码级别并且很容易解决，但是就库而言，解决这个问题的最佳方法是什么？

仅供参考：我们正在使用 Django2.1.7 从 python 2.7 和 django 1.5.5

迁移到 python3.7

UPDATE (Solved)

根据 mfrackowiak 的 below we have to fork their repo, applied patch for the support and install from the changed version。然后对我有用

Answer 1

我找到了这两个包：

如果这是您正在使用的软件包 django-json-field，请查看 2014 年的最后一个版本，因此我很确定此软件包与 Django 2.0
如果 jsonfield 是您的软件包，那么即使他们不支持 Django 2.0。他们有 1.8 到 1.11

Post 在你的代码中你打算使用那个包做什么，然后我可以给你一个自定义的解决方案或包，它实际上支持 2.0 并完成工作。

Answer 2

似乎 package is unmaintained for a long time, the best way to deal with this error would be either look for alternatives 或者只是分叉回购并自己更新它，这样它仍然可以工作（可能比为另一个库调整代码库更容易）。

Django2.1.7 ImportError: cannot import name 'util' from 'django.forms' (/Users/lib/python3.7/site-packages/django/forms/init.py)