django.core.exceptions.ImproperlyConfigured：请求设置 USE_I18N，但未配置设置

我想将MySQL数据库连接到我的Django项目，但它抛出了一个错误:

"django.core.exceptions.ImpartlyConfiguring:请求的设置 使用_i18n，但未配置设置.您必须定义 环境变量DJANGO_SETTINGS_MODULE或调用 settings.configure()，然后再访问设置."

Trace:个

 (myenv) LIBINGLADWINs-MacBook-Air:libinrenold$ django-admin dbshell
Traceback (most recent call last):
  File "/Users/libinrenold/Desktop/djangoworks/myenv/bin/django-admin", line 11, in <module>
    sys.exit(execute_from_command_line())
  File "/Users/libinrenold/Desktop/djangoworks/myenv/lib/python3.6/site-packages/django/core/management/__init__.py", line 364, in execute_from_command_line
    utility.execute()
  File "/Users/libinrenold/Desktop/djangoworks/myenv/lib/python3.6/site-packages/django/core/management/__init__.py", line 356, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/Users/libinrenold/Desktop/djangoworks/myenv/lib/python3.6/site-packages/django/core/management/base.py", line 283, in run_from_argv
    self.execute(*args, **cmd_options)
  File "/Users/libinrenold/Desktop/djangoworks/myenv/lib/python3.6/site-packages/django/core/management/base.py", line 322, in execute
    saved_locale = translation.get_language()
  File "/Users/libinrenold/Desktop/djangoworks/myenv/lib/python3.6/site-packages/django/utils/translation/__init__.py", line 195, in get_language
    return _trans.get_language()
  File "/Users/libinrenold/Desktop/djangoworks/myenv/lib/python3.6/site-packages/django/utils/translation/__init__.py", line 59, in __getattr__
    if settings.USE_I18N:
  File "/Users/libinrenold/Desktop/djangoworks/myenv/lib/python3.6/site-packages/django/conf/__init__.py", line 56, in __getattr__
    self._setup(name)
  File "/Users/libinrenold/Desktop/djangoworks/myenv/lib/python3.6/site-packages/django/conf/__init__.py", line 39, in _setup
    % (desc, ENVIRONMENT_VARIABLE))
django.core.exceptions.ImproperlyConfigured: Requested setting USE_I18N, but settings are not configured. You must either define the environment variable DJANGO_SETTINGS_MODULE or call settings.configure() before accessing settings.

settings.py

  DATABASES = {
        'default': {
        'ENGINE': 'django.db.backends.mysql',
        'NAME': 'test',
        'USER': 'user',
        'PASSWORD': 'root',
        'HOST':'',
        'PORT': '',
        }
     }