code: def get_current_key(self):
      return self._function_context.get_current_key()
  
file_path: flink/flink-python/pyflink/fn_execution/embedded/state_impl.py
imports: from pemja import findClass
  from pyflink.datastream.state import ValueStateDescriptor, ListStateDescriptor, MapStateDescriptor, StateDescriptor, ReducingStateDescriptor, AggregatingStateDescriptor
  from pyflink.fn_execution.datastream.embedded.state_impl import ValueStateImpl, ListStateImpl, MapStateImpl, ReducingStateImpl, AggregatingStateImpl
  from pyflink.fn_execution.embedded.converters import from_type_info
  from pyflink.fn_execution.embedded.java_utils import to_java_state_descriptor
label_desc: Use image node_id 2 for calling the KeyedStateBackend obj's underlying member method code with example usage: obj.get_current_key() and returns: self