code: def extract_timestamp(self, value, record_timestamp: int) -> int:
      return int(value[0])
  
file_path: flink/flink-python/pyflink/examples/datastream/event_time_timer.py
imports: from pyflink.common import Time, WatermarkStrategy, Duration
  from pyflink.common.typeinfo import Types
  from pyflink.common.watermark_strategy import TimestampAssigner
  from pyflink.datastream import StreamExecutionEnvironment
  from pyflink.datastream.functions import KeyedProcessFunction, RuntimeContext
  from pyflink.datastream.state import ValueStateDescriptor, StateTtlConfig
label_desc: Use image node_id 1 for calling the MyTimestampAssigner obj's underlying member method code with example usage: obj.extract_timestamp(value, record_timestamp) and returns: int