NameError:没有定义名称'_mysql‘- Django顺风

Question

当我运行python manage.py runserver时，我的django服务器运行，我可以看到我的网页，但是有些顺风不起作用。

然后，当我停止该服务器并运行python manage.py tailwind start时，localhost:8000不会显示我的网页，但是我的终端显示它正在运行。

然后，当我停止顺风服务器运行并运行python manage.py runserver时，我会看到一个错误：NameError: name '_mysql' is not defined。

我不知道为什么会发生这种情况，下面是我的全部堆栈跟踪：

Traceback (most recent call last):
  File "/Users/maxculley/Desktop/ESD COURSEWORK/venv/lib/python3.8/site-packages/MySQLdb/__init__.py", line 18, in <module>
    from . import _mysql
ImportError: dlopen(/Users/maxculley/Desktop/ESD COURSEWORK/venv/lib/python3.8/site-packages/MySQLdb/_mysql.cpython-38-darwin.so, 2): Library not loaded: @rpath/libmysqlclient.21.dylib
  Referenced from: /Users/maxculley/Desktop/ESD COURSEWORK/venv/lib/python3.8/site-packages/MySQLdb/_mysql.cpython-38-darwin.so
  Reason: image not found

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "manage.py", line 22, in <module>
    main()
  File "manage.py", line 18, in main
    execute_from_command_line(sys.argv)
  File "/Users/maxculley/Desktop/ESD COURSEWORK/venv/lib/python3.8/site-packages/django/core/management/__init__.py", line 425, in execute_from_command_line
    utility.execute()
  File "/Users/maxculley/Desktop/ESD COURSEWORK/venv/lib/python3.8/site-packages/django/core/management/__init__.py", line 401, in execute
    django.setup()
  File "/Users/maxculley/Desktop/ESD COURSEWORK/venv/lib/python3.8/site-packages/django/__init__.py", line 24, in setup
    apps.populate(settings.INSTALLED_APPS)
  File "/Users/maxculley/Desktop/ESD COURSEWORK/venv/lib/python3.8/site-packages/django/apps/registry.py", line 114, in populate
    app_config.import_models()
  File "/Users/maxculley/Desktop/ESD COURSEWORK/venv/lib/python3.8/site-packages/django/apps/config.py", line 300, in import_models
    self.models_module = import_module(models_module_name)
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/importlib/__init__.py", line 127, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 1014, in _gcd_import
  File "<frozen importlib._bootstrap>", line 991, in _find_and_load
  File "<frozen importlib._bootstrap>", line 975, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 671, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 783, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/Users/maxculley/Desktop/ESD COURSEWORK/venv/lib/python3.8/site-packages/django/contrib/auth/models.py", line 3, in <module>
    from django.contrib.auth.base_user import AbstractBaseUser, BaseUserManager
  File "/Users/maxculley/Desktop/ESD COURSEWORK/venv/lib/python3.8/site-packages/django/contrib/auth/base_user.py", line 47, in <module>
    class AbstractBaseUser(models.Model):
  File "/Users/maxculley/Desktop/ESD COURSEWORK/venv/lib/python3.8/site-packages/django/db/models/base.py", line 122, in __new__
    new_class.add_to_class('_meta', Options(meta, app_label))
  File "/Users/maxculley/Desktop/ESD COURSEWORK/venv/lib/python3.8/site-packages/django/db/models/base.py", line 326, in add_to_class
    value.contribute_to_class(cls, name)
  File "/Users/maxculley/Desktop/ESD COURSEWORK/venv/lib/python3.8/site-packages/django/db/models/options.py", line 207, in contribute_to_class
    self.db_table = truncate_name(self.db_table, connection.ops.max_name_length())
  File "/Users/maxculley/Desktop/ESD COURSEWORK/venv/lib/python3.8/site-packages/django/utils/connection.py", line 15, in __getattr__
    return getattr(self._connections[self._alias], item)
  File "/Users/maxculley/Desktop/ESD COURSEWORK/venv/lib/python3.8/site-packages/django/utils/connection.py", line 62, in __getitem__
    conn = self.create_connection(alias)
  File "/Users/maxculley/Desktop/ESD COURSEWORK/venv/lib/python3.8/site-packages/django/db/utils.py", line 204, in create_connection
    backend = load_backend(db['ENGINE'])
  File "/Users/maxculley/Desktop/ESD COURSEWORK/venv/lib/python3.8/site-packages/django/db/utils.py", line 111, in load_backend
    return import_module('%s.base' % backend_name)
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/importlib/__init__.py", line 127, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "/Users/maxculley/Desktop/ESD COURSEWORK/venv/lib/python3.8/site-packages/django/db/backends/mysql/base.py", line 15, in <module>
    import MySQLdb as Database
  File "/Users/maxculley/Desktop/ESD COURSEWORK/venv/lib/python3.8/site-packages/MySQLdb/__init__.py", line 24, in <module>
    version_info, _mysql.version_info, _mysql.__file__
NameError: name '_mysql' is not defined

Answer 1

我最近几天也遇到了同样的错误，只是找到了这个解决方案，而且它对我有用，希望它能帮助我！

pip freeze

1. 使用以下命令检查mysqlclient是否已安装：

1. 给zsh添加env变量，或为bash添加~/..bashrc或~/.bash_profile等)：export DYLD_LIBRARY_PATH=/usr/local/mysql/lib/

运行source ~/.your_shell_config_file应用更改的

来源：https://medium.com/@cui.shinan0812/django-reason-image-not-found-nameerror-name-mysql-is-not-defined-a0d834c2d7b4