在Python 3.6中将推文保存到JSON文件

我正在使用tweepy库下载某些用户的推文。我想将这些推文保存到JSON文件中,但我收到以下错误:

getTweetsList中第63行的文件“” json。转储(状态。\u json,file,sort\u keys=True,indent=4)

文件“C:\ProgramData\Anaconda3\lib\json\uuu init\uuuuuuuuuu0.py”,第180行,in 倾倒

fp。写入(区块)

TypeError:需要类似字节的对象,而不是“str”

代码如下:

def getTweetsList(self, screen_name):
    # Twitter only allows access to a users most recent 3240 tweets with this method
    # initialize a list to hold all the tweepy Tweets
    alltweets = []  

    # make initial request for most recent tweets (200 is the maximum allowed count)
    new_tweets = self.api.user_timeline(screen_name = screen_name,count=200)

    # save most recent tweets
    alltweets.extend(new_tweets)

    # save the id of the oldest tweet less one
    oldest = alltweets[-1].id - 1

    # keep grabbing tweets until there are no tweets left to grab
    while len(new_tweets) > 0:  
        # all subsiquent requests use the max_id param to prevent duplicates
        new_tweets = self.api.user_timeline(screen_name = screen_name,count=200,max_id=oldest)

        # save most recent tweets
        alltweets.extend(new_tweets)

        # update the id of the oldest tweet less one
        oldest = alltweets[-1].id - 1

        print("...%s tweets downloaded so far" % (len(alltweets)))

    print("Total tweets downloaded %s" % (len(alltweets)))
    file = open('tweet.json', 'wb') 
    print("Writing tweet objects to JSON please wait...")
    for status in alltweets:
        json.dump(status._json,file,sort_keys = True,indent = 4)
    return alltweets

我到处寻找答案,但没有一个解决方案对我有效。我认为这可能与Python 3.6有关。