API网关返回额外的数据错误

Question

下面是我的python lambda函数

import sys
import logging
import pymysql
import json
import boto3
rds_host="rds.amazonaws.com"
name="name"
password="pass"
db_name="DB"
port = 3306
def save_events(event):
result = []
conn = pymysql.connect(rds_host, user=name, passwd=password, db=db_name, 
connect_timeout=30)
with conn.cursor(pymysql.cursors.DictCursor) as cur:
cur.execute("select exid,exercise_name,image from exercise where bid = event['params']['querystring']['Bid']")
result = cur.fetchall()
cur.close()
print ("Data from RDS...")
print (result)
workout = json.dumps(result)
workouts=(workout.replace("\"", "'"))

def lambda_handler(event, context):
save_events(event)
return workouts

我在API网关中创建了get方法，并与上述lambda函数集成在一起，在方法请求中，我将查询字符串指定为“出价”，在集成请求中，我将映射模板添加为“出价”：“ $ input.params（ 'bid'）”，当我测试提供查询参数为“ Bid = 1”的API时，它会返回以下错误

{"errorMessage": "Extra data: line 1 column 6 (char 5)", "errorType": "JSONDecodeError", "stackTrace": [["/var/lang/lib/python3.6/json/__init__.py", 354, "loads", "return _default_decoder.decode(s)"], ["/var/lang/lib/python3.6/json/decoder.py", 342, "decode", "raise JSONDecodeError(\"Extra data\", s, end)"]]}

我也使用了lambda代理集成，并且在上述错误中也得到了相同的结果。请帮助我被打到这里，谢谢。