按位置过滤Tweets

Question

我试图修改这个脚本，只保存带有一个位置的tweet的JSON，并且在Python中遇到了一个问题，在那里检查不为空似乎不起作用。have键不能正常工作，因为它们都有键，其中大多数都是'null‘。不是没有工作，因为Python认为空和没有不同，并检查它作为文本不为“空”也没有工作。有没有人对如何解决这个问题有一个聪明的主意？

from tweepy.streaming import StreamListener
from tweepy import OAuthHandler
from tweepy import Stream
import pymongo
import tweepy
import json


#Variables that contains the user credentials to access Twitter API 
access_key = '' #redacted for privacy and such
access_secret = ''
consumer_key = ''
consumer_secret = ''

#Runs auth to Twitter API
auth = tweepy.OAuthHandler(consumer_key, consumer_secret)
auth.set_access_token(access_key, access_secret)
api = tweepy.API(auth)


#This is a basic listener that will print incoming data to stdout
class StdOutListener(StreamListener):

    def on_data(self, data):
        print data
        return True

    def on_error(self, status):
        print status


#Customizes the stream and saves text and lang to databases 
class CustomStreamListener(tweepy.StreamListener):
    def __init__(self, api):
        self.api = api
        super(tweepy.StreamListener, self).__init__()
        self.db = pymongo.MongoClient('localhost', 27017).crime



    def on_data(self, data):
        jd = json.loads(data)
        if jd.has_key('coordinates') :
            self.db.tweets.insert( { 'text' : jd['text'], 'coordinates' : jd['coordinates'], 'lang' : jd['lang'] } )




    def on_error(self, status_code):
        return True # Don't kill the stream

    def on_timeout(self):
        return True # Don't kill the stream

#Calls on StreamListerner and provides specifications of tracking
l = tweepy.streaming.Stream(auth, CustomStreamListener(api))
l.filter(track=['guns'])

Answer 1

您可以尝试检查字符串的长度：

if len( jd['coordinates'] ) > 1:
    self.db.tweets.insert( { 'text' : jd['text'], 'coordinates' : jd['coordinates'], 'lang' : jd['lang'] } )