python - 谷歌应用引擎+python(django)部署错误: Error loading MySQLdb module

Question

我正在 Google App Engine 上创建一个应用程序。我正在使用 Django 1.4 和 Python 2.7。在本地主机上一切正常。但是在部署之后它没有运行，我一直在管理日志中看到这个:

    2012-12-15 15:02:41.870

    /base/python27_runtime/python27_lib/versions/1/lib/cacerts/urlfetch_cacerts.txt missing; without this urlfetch will not be able to validate SSL certificates.

    W 2012-12-15 15:02:41.870

    No ssl package found. urlfetch will not be able to validate SSL certificates.

    E 2012-12-15 15:02:46.086

    Traceback (most recent call last):
      File "/base/python27_runtime/python27_lib/versions/1/google/appengine/runtime/wsgi.py", line 196, in Handle
        handler = _config_handle.add_wsgi_middleware(self._LoadHandler())
      File "/base/python27_runtime/python27_lib/versions/1/google/appengine/runtime/wsgi.py", line 266, in _LoadHandler
        __import__(cumulative_path)
      File "/base/data/home/apps/s~cloudwallforever/1.363864476397206865/djangoappengine/main/__init__.py", line 28, in <module>
        setup_env()
      File "/base/data/home/apps/s~cloudwallforever/1.363864476397206865/djangoappengine/boot.py", line 82, in setup_env
        setup_logging()
      File "/base/data/home/apps/s~cloudwallforever/1.363864476397206865/djangoappengine/boot.py", line 130, in setup_logging
        if not settings.DEBUG:
      File "/base/data/home/apps/s~cloudwallforever/1.363864476397206865/django/utils/functional.py", line 276, in __getattr__
        self._setup()
      File "/base/data/home/apps/s~cloudwallforever/1.363864476397206865/django/conf/__init__.py", line 42, in _setup
        self._wrapped = Settings(settings_module)
      File "/base/data/home/apps/s~cloudwallforever/1.363864476397206865/django/conf/__init__.py", line 87, in __init__
        mod = importlib.import_module(self.SETTINGS_MODULE)
      File "/base/data/home/apps/s~cloudwallforever/1.363864476397206865/django/utils/importlib.py", line 35, in import_module
        __import__(name)
      File "/base/data/home/apps/s~cloudwallforever/1.363864476397206865/settings.py", line 6, in <module>
        import django.db.backends.mysql.base
      File "/base/data/home/apps/s~cloudwallforever/1.363864476397206865/django/db/backends/mysql/base.py", line 14, in <module>
        raise ImproperlyConfigured("Error loading MySQLdb module: %s" % e)
    ImproperlyConfigured: Error loading MySQLdb module: No module named MySQLdb

知道为什么会这样吗？

Answer 1

“Django 支持”文档暗示了解决方案，但没有明确说明:

Since the standard django.db.backends.mysql backend uses MySQLdb internally, app.yaml must reference MySQLdb in the list of libraries.

将以下内容添加到 app.yaml 似乎可以修复 ImportError:

libraries:
- name: MySQLdb
  version: "latest"

请注意，MySQLdb 当前未包含在 available third party libraries 的列表中.我一时兴起尝试了一下，它似乎为我解决了这个问题，YMMV。 enter link description here