pyflink yield return

//yield

import json
import re
import logging
import sys
from collections import Counter

from pyflink.datastream import DataStream, StreamExecutionEnvironment
from pyflink.datastream.functions import RuntimeContext, FlatMapFunction, MapFunction,KeySelector
from pyflink.common.typeinfo import Types

s_env = StreamExecutionEnvironment.get_execution_environment()
data = DataStream(s_env._j_stream_execution_environment.socketTextStream('192.168.137.201', 8899))
    #data.print()
def get_key():
        return '999'
class LogEvent:
    world=None

    def __init__(self,world,count):
        self.world = world
        self.count = count
    def to_dict(self):
        return {
            "world": str(self.world),
            "count": str(self.count)

        }

class MyMapFun