这是我在mysql中插入tweet数据的代码

import pymysql
import tweepy
import time
import json
from tweepy import Stream
from tweepy import OAuthHandler
from tweepy.streaming import StreamListener
import pymysql.cursors
ckey= ''
csecret= ''
atoken=''
asecret=''
conn = pymysql.connect(host='localhost', port=3306, user='root', passwd='admin1234', db='mysql')
cur = conn.cursor()
class listener(StreamListener):
 def on_data(self, data):
        all_data = json.loads(data)
        tweet = all_data["text"]
        a=0
        #username = all_data["user"]["screen_name"]
        cur.execute("INSERT INTO tweet (textt) VALUES (%s)" (tweet))
        print (tweet)
        return True
def on_error(self, status):
    print (status)
auth = OAuthHandler(ckey, csecret)
auth.set_access_token(atoken, asecret)
twitterStream = Stream(auth, listener())
twitterStream.filter(track = ["puasa"])
cur.close()
conn.close()

但我犯了个错误 TypeError: 'str' object is not callable 回溯错误

Traceback (most recent call last):
  File "collect-sql.py", line 40, in <module>
    twitterStream.filter(track = ["puasa"])
  File "/Users/amzar/anaconda3/lib/python3.6/site-packages/tweepy/streaming.py", line 450, in filter
    self._start(async)
  File "/Users/amzar/anaconda3/lib/python3.6/site-packages/tweepy/streaming.py", line 364, in _start
    self._run()
  File "/Users/amzar/anaconda3/lib/python3.6/site-packages/tweepy/streaming.py", line 297, in _run
    six.reraise(*exc_info)
  File "/Users/amzar/anaconda3/lib/python3.6/site-packages/six.py", line 693, in reraise
    raise value
  File "/Users/amzar/anaconda3/lib/python3.6/site-packages/tweepy/streaming.py", line 266, in _run
    self._read_loop(resp)
  File "/Users/amzar/anaconda3/lib/python3.6/site-packages/tweepy/streaming.py", line 327, in _read_loop
    self._data(next_status_obj)
  File "/Users/amzar/anaconda3/lib/python3.6/site-packages/tweepy/streaming.py", line 300, in _data
    if self.listener.on_data(data) is False:
  File "collect-sql.py", line 30, in on_data
    cur.execute("INSERT INTO tweet (textt) VALUES (%s)" (tweet))
TypeError: 'str' object is not callable