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rest_api using tweets are not dumping into file in python

according to this code a file should be with 5000 tweets in this. But nothing is going into file and shows json serialization error.

here is the code
alltweet=[]
def rest_query_ex3():
    MAX_ID = None
    query = "(disease OR illness OR sickness)"
    file=open("tweetfile.txt", "a+")
    for it in range(50):
     tweets = myApi.search(q=query, count=100, max_id=MAX_ID)
     if tweets:
         MAX_ID = tweets[-1].id
         alltweet.extend(tweets)
    for tweet in alltweet:
        s=[tweet.text, tweet.id]
        file.write(json.dumps(s))
    file.close()