code: def get_async(cls, blob_key, **ctx_options):
      
      if not isinstance(blob_key, (BlobKey, basestring)):
        raise TypeError('Expected blob key, got %r' % (blob_key,))
      if 'parent' in ctx_options:
        raise TypeError('Parent is not supported')
      return cls.get_by_id_async(str(blob_key), **ctx_options)
docs: Async version of get().