class_docstr: This is a mock class implementation of KmsClient, built for testing
  only.
docstr: Create an InMemoryKmsClient instance.
docstr_tok: ["Create","an","InMemoryKmsClient","instance","."]
code: def __init__(self, config):
      """Create an InMemoryKmsClient instance."""
      pe.KmsClient.__init__(self)
      self.master_keys_map = config.custom_kms_conf
  
file_path: arrow/python/pyarrow/tests/parquet/encryption.py
imports: import base64
  import pyarrow.parquet.encryption
label_desc: Use image node_id 1 to create a new InMemoryKmsClient object from inherited base classes: pe with example: obj = InMemoryKmsClient(config)