读取和打印数据colab

Question

请协助我尝试打印结果，当我运行代码时，不会打印任何内容

#read the tweets stored in the file
    tweets_data_path='tweet.txt'
    tweets_data=[]
    tweets_file=open(tweets_data_path,"r")
    #read in tweets and store on list
    for line in tweets_file:
      tweet=json.loads(line)
      tweets_data.append(tweet)
      tweets_file.close() 
      print(tweets_data[0])

我试图更改最后一行的缩进，但收到以下错误

#read the tweets stored in the file
tweets_data_path='tweet.txt'
tweets_data=[]
tweets_file=open(tweets_data_path,"r")
#read in tweets and store on list
for line in tweets_file:
  tweet=json.loads(line)
  tweets_data.append(tweet)
  tweets_file.close() 
print(tweets_data[0])


IndexError                                Traceback (most recent call last)
<ipython-input-48-f5407f1436ea> in <module>()
      8   tweets_data.append(tweet)
      9   tweets_file.close()
---> 10 print(tweets_data[0])

IndexError: list index out of range

请指教

Answer 1

如果文件为空，则没有要打印的内容。以下是我的建议，以避免因文件为空而出现异常：

# read the tweets stored in the file
tweets_data_path = 'tweet.txt'
tweets_data = []
tweets_file = open(tweets_data_path, "r")

# read in tweets and store on list
for line in tweets_file:
    tweet = json.loads(line)
    tweets_data.append(tweet)

tweets_file.close()

if len(tweets_data) > 0:
    print(tweets_data[0])