src/google/appengine/datastore/datastore_rpc.py [2752:2782]:
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  datastore_app_id = os.environ.get(_DATASTORE_APP_ID_ENV, None)
  datastore_project_id = os.environ.get(_DATASTORE_PROJECT_ID_ENV, None)
  if datastore_app_id or datastore_project_id:

    app_id_override = bool(os.environ.get(
        _DATASTORE_USE_PROJECT_ID_AS_APP_ID_ENV, False))
    if not datastore_app_id and not app_id_override:
      raise ValueError('Could not determine app id. To use project id (%s) '
                       'instead, set %s=true. This will affect the '
                       'serialized form of entities and should not be used '
                       'if serialized entities will be shared between '
                       'code running on App Engine and code running off '
                       'App Engine. Alternatively, set %s=<app id>.'
                       % (datastore_project_id,
                          _DATASTORE_USE_PROJECT_ID_AS_APP_ID_ENV,
                          _DATASTORE_APP_ID_ENV))
    elif datastore_app_id:
      if app_id_override:
        raise ValueError('App id was provided (%s) but %s was set to true. '
                         'Please unset either %s or %s.' %
                         (datastore_app_id,
                          _DATASTORE_USE_PROJECT_ID_AS_APP_ID_ENV,
                          _DATASTORE_APP_ID_ENV,
                          _DATASTORE_USE_PROJECT_ID_AS_APP_ID_ENV))
      elif datastore_project_id:

        id_resolver = datastore_pbs.IdResolver([datastore_app_id])
        if (datastore_project_id !=
            id_resolver.resolve_project_id(datastore_app_id)):
          raise ValueError('App id "%s" does not match project id "%s".'
                           % (datastore_app_id, datastore_project_id))
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src/google/appengine/ext/ndb/tasklets.py [1167:1197]:
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  datastore_app_id = os.environ.get(_DATASTORE_APP_ID_ENV, None)
  datastore_project_id = os.environ.get(_DATASTORE_PROJECT_ID_ENV, None)
  if datastore_app_id or datastore_project_id:

    app_id_override = bool(os.environ.get(
        _DATASTORE_USE_PROJECT_ID_AS_APP_ID_ENV, False))
    if not datastore_app_id and not app_id_override:
      raise ValueError('Could not determine app id. To use project id (%s) '
                       'instead, set %s=true. This will affect the '
                       'serialized form of entities and should not be used '
                       'if serialized entities will be shared between '
                       'code running on App Engine and code running off '
                       'App Engine. Alternatively, set %s=<app id>.'
                       % (datastore_project_id,
                          _DATASTORE_USE_PROJECT_ID_AS_APP_ID_ENV,
                          _DATASTORE_APP_ID_ENV))
    elif datastore_app_id:
      if app_id_override:
        raise ValueError('App id was provided (%s) but %s was set to true. '
                         'Please unset either %s or %s.' %
                         (datastore_app_id,
                          _DATASTORE_USE_PROJECT_ID_AS_APP_ID_ENV,
                          _DATASTORE_APP_ID_ENV,
                          _DATASTORE_USE_PROJECT_ID_AS_APP_ID_ENV))
      elif datastore_project_id:

        id_resolver = datastore_pbs.IdResolver([datastore_app_id])
        if (datastore_project_id !=
            id_resolver.resolve_project_id(datastore_app_id)):
          raise ValueError('App id "%s" does not match project id "%s".'
                           % (datastore_app_id, datastore_project_id))
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