当零字发生时的错误

Question

首先，对不起我的英文破碎。

我使用此代码来计算单词“LeBron”或“Curry”在推文上出现的次数。问题是，如果没有任何推文包含单词“勒布朗”或“咖喱”程序崩溃。单词在那里，程序运行完美。

tweets_data_path = '/Users/HCruz/NetBeansProjects/elections3/data/fetched_tweets.txt' 

tweets_data = [] 
tweets_file = open(tweets_data_path, "r") 
for line in tweets_file: 
    try: 
     tweet = json.loads(line) 
     tweets_data.append(tweet) 
    except: 
     continue 

tweets = pd.DataFrame() 

tweets['text'] = map(lambda tweet: tweet['text'], tweets_data) 

def word_in_text(word, text): 
    word = word.lower() 
    text = text.lower() 
    match = re.search(word, text) 
    if match: 
     return True 
     return False 

tweets['LeBron'] = tweets['text'].apply(lambda tweet: word_in_text('LeBron', tweet)) 
tweets['Curry'] = tweets['text'].apply(lambda tweet: word_in_text('Curry', tweet)) 

LeBron = tweets['LeBron'].value_counts()[True] 
Curry = tweets['Curry'].value_counts()[True] 

print("LeBron %s" % LeBron) 
print("Curry %s" % Curry) 

即使世界上ATLEAST各一个的， “咖喱” 或 “勒布朗” 我得到这个：

Processing... 
LeBron 1 
Curry 34 

那是完美的。

但是，如果我删除“勒布朗”，所以没有勒布朗发生，程序崩溃。

Hectors-iMac:src HCruz$ python process_tweets.py 
Processing... 
Traceback (most recent call last): 
    File "process_tweets.py", line 80, in <module> 
    s.run() 
    File  "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/sched.py", line 117, in run 
action(*argument) 
    File "process_tweets.py", line 54, in processing 
    process_tweets() 
    File "process_tweets.py", line 44, in process_tweets 
LeBron = tweets['LeBron'].value_counts()[True] 
    File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/pandas/core/series.py", line 491, in __getitem__ 
result = self.index.get_value(self, key) 
    File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/pandas/core/index.py", line 1038, in get_value 
return tslib.get_value_box(s, key) 
    File "tslib.pyx", line 454, in pandas.tslib.get_value_box (pandas/tslib.c:9561) 
    File "tslib.pyx", line 469, in pandas.tslib.get_value_box (pandas/tslib.c:9408) 
IndexError: index out of bounds 

Answer 1

使用异常处理的周边上的try/catch线44代码：

try: 
    LeBron = tweets['LeBron'].value_counts()[True] 
except IndexError: 
    LeBron = 0