Import error when trying to access sdk datastore admin
If it in app engine SDK's lib, e.g on Mac it's
/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/lib/
Copy it over to app's dir would work. It's better than pip install and then copy over, which may contain c-extension. The modules in SDK's lib path (at least simplejson) seems to have been modified to work with app engine's needs.
I'm getting a "ImportError: No module named simplejson" when trying to access datastore admin on the development server.
After the first time I got this error I installed the simplejson package from slackbuilds (i'm on Slackware). It seems to be working normally, I could import the simplejson module with no errors on the python console.
But the import error persists when I try to access datastore admin, even after installing the module. Restarting the development server didn't do anything.
What could be wrong?
Edit: here's the stacktrace:

Traceback (most recent call last):
  File
  "/home/lwlun/AppEngine/google_appengine/google/appengine/tools/dev_appserver.py",
  line 3245, in _HandleRequest
      self._Dispatch(dispatcher, self.rfile, outfile, env_dict)   File
  "/home/lwlun/AppEngine/google_appengine/google/appengine/tools/dev_appserver.py",
  line 3186, in _Dispatch
      base_env_dict=env_dict)   File "/home/lwlun/AppEngine/google_appengine/google/appengine/tools/dev_appserver.py",
  line 531, in Dispatch
      base_env_dict=base_env_dict)   File
  "/home/lwlun/AppEngine/google_appengine/google/appengine/tools/dev_appserver.py",
  line 2410, in Dispatch
      self._module_dict)   File "/home/lwlun/AppEngine/google_appengine/google/appengine/tools/dev_appserver.py",
  line 2320, in ExecuteCGI
      reset_modules = exec_script(handler_path, cgi_path,
  hook)   File
  "/home/lwlun/AppEngine/google_appengine/google/appengine/tools/dev_appserver.py",
  line 2216, in ExecuteOrImportScript
      exec module_code in script_module.dict   File
  "/home/lwlun/AppEngine/google_appengine/google/appengine/ext/datastore_admin/main.py",
  line 30, in 
      from google.appengine.ext.datastore_admin
  import copy_handler   File
  "/home/lwlun/AppEngine/google_appengine/google/appengine/tools/dev_appserver.py",
  line 1295, in Decorate
      return func(self, *args, **kwargs)   File
  "/home/lwlun/AppEngine/google_appengine/google/appengine/tools/dev_appserver.py",
  line 1945, in load_module
      return self.FindAndLoadModule(submodule,
  fullname, search_path)   File
  "/home/lwlun/AppEngine/google_appengine/google/appengine/tools/dev_appserver.py",
  line 1295, in Decorate
      return func(self, *args, **kwargs)   File
  "/home/lwlun/AppEngine/google_appengine/google/appengine/tools/dev_appserver.py",
  line 1847, in FindAndLoadModule
      description)   File "/home/lwlun/AppEngine/google_appengine/google/appengine/tools/dev_appserver.py",
  line 1295, in Decorate
      return func(self, *args, **kwargs)   File
  "/home/lwlun/AppEngine/google_appengine/google/appengine/tools/dev_appserver.py",
  line 1798, in LoadModuleRestricted
      description)   File "/home/lwlun/AppEngine/google_appengine/google/appengine/ext/datastore_admin/copy_handler.py",
  line 40, in 
      from google.appengine.ext.datastore_admin
  import utils   File
  "/home/lwlun/AppEngine/google_appengine/google/appengine/tools/dev_appserver.py",
  line 1295, in Decorate
      return func(self, *args, **kwargs)   File
  "/home/lwlun/AppEngine/google_appengine/google/appengine/tools/dev_appserver.py",
  line 1945, in load_module
      return self.FindAndLoadModule(submodule,
  fullname, search_path)   File
  "/home/lwlun/AppEngine/google_appengine/google/appengine/tools/dev_appserver.py",
  line 1295, in Decorate
      return func(self, *args, **kwargs)   File
  "/home/lwlun/AppEngine/google_appengine/google/appengine/tools/dev_appserver.py",
  line 1847, in FindAndLoadModule
      description)   File "/home/lwlun/AppEngine/google_appengine/google/appengine/tools/dev_appserver.py",
  line 1295, in Decorate
      return func(self, *args, **kwargs)   File
  "/home/lwlun/AppEngine/google_appengine/google/appengine/tools/dev_appserver.py",
  line 1798, in LoadModuleRestricted
      description)   File "/home/lwlun/AppEngine/google_appengine/google/appengine/ext/datastore_admin/utils.py",
  line 35, in 
      from google.appengine.ext.mapreduce import
  control   File
  "/home/lwlun/AppEngine/google_appengine/google/appengine/tools/dev_appserver.py",
  line 1295, in Decorate
      return func(self, *args, **kwargs)   File
  "/home/lwlun/AppEngine/google_appengine/google/appengine/tools/dev_appserver.py",
  line 1945, in load_module
      return self.FindAndLoadModule(submodule,
  fullname, search_path)   File
  "/home/lwlun/AppEngine/google_appengine/google/appengine/tools/dev_appserver.py",
  line 1295, in Decorate
      return func(self, *args, **kwargs)   File
  "/home/lwlun/AppEngine/google_appengine/google/appengine/tools/dev_appserver.py",
  line 1847, in FindAndLoadModule
      description)   File "/home/lwlun/AppEngine/google_appengine/google/appengine/tools/dev_appserver.py",
  line 1295, in Decorate
      return func(self, *args, **kwargs)   File
  "/home/lwlun/AppEngine/google_appengine/google/appengine/tools/dev_appserver.py",
  line 1798, in LoadModuleRestricted
      description)   File "/home/lwlun/AppEngine/google_appengine/google/appengine/ext/mapreduce/control.py",
  line 26, in 
      from google.appengine.ext.mapreduce import
  handlers   File
  "/home/lwlun/AppEngine/google_appengine/google/appengine/tools/dev_appserver.py",
  line 1295, in Decorate
      return func(self, *args, **kwargs)   File
  "/home/lwlun/AppEngine/google_appengine/google/appengine/tools/dev_appserver.py",
  line 1945, in load_module
      return self.FindAndLoadModule(submodule,
  fullname, search_path)   File
  "/home/lwlun/AppEngine/google_appengine/google/appengine/tools/dev_appserver.py",
  line 1295, in Decorate
      return func(self, *args, **kwargs)   File
  "/home/lwlun/AppEngine/google_appengine/google/appengine/tools/dev_appserver.py",
  line 1847, in FindAndLoadModule
      description)   File "/home/lwlun/AppEngine/google_appengine/google/appengine/tools/dev_appserver.py",
  line 1295, in Decorate
      return func(self, *args, **kwargs)   File
  "/home/lwlun/AppEngine/google_appengine/google/appengine/tools/dev_appserver.py",
  line 1798, in LoadModuleRestricted
      description)   File "/home/lwlun/AppEngine/google_appengine/google/appengine/ext/mapreduce/handlers.py",
  line 26, in 
      import simplejson ImportError: No module named simplejson