我想遍历标准Twitter流API的输出，如果country_code =='US'，则将地名打印到stdout：
import sys
import json
def loc_tweets(tw_file):
for line in tw_file:
tweet = json.loads(line)
if tweet.get("country_code", None) == "US":
print tweet.get("full_name", None)
else:
print "Nope"
def main():
tweet_file = open(sys.argv[1])
loc_tweets(tweet_file)
if __name__ == '__main__':
main()
我的最终目标是对所有tweet的情绪进行评分，然后将美国各州的平均情绪汇总到字典中，但是我必须走起来才能跑步。我尝试将if条件设置为非None：
if tweet.get("country_code", None) != None:
但是“ Nope”是我仍然收到的唯一值。我知道我使用的文件包含有效的country_codes和full_names，因为我手动对文件进行了排序并找到了它们。不确定我做错了什么，我们将不胜感激！
编辑：
带有有效country_code的json示例行：
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