code: def _shard_size(cls, value):
      if value is not None:
          assert (
              isinstance(value, int) and value > 0
          ), "shard size should be either None or a positive integer."
      cls.__shard_size = value
  
imports: import os
  from zoo import ZooContext
label_desc: Use image node_id 12 for calling the OrcaContextMeta obj's underlying member method code with example usage: obj._shard_size(cls, value) without return types