我有一个带有更新值的字典，我想使用python代码用solr中的动态值更新字段值。例如，我展示了 retweet_count 此字段在每次更改时都是动态的。
它不应该是多值字段。
代码：

try:
                        if res['retweet_count'] != tweets['retweet_count']:
                            print "retweet increased  . . old retweets : ", res['retweet_count'], " new retweets : ", tweets['retweet_count']
                            res['retweet_count'] = tweets['retweet_count']
                    except KeyError:
                        print "retweet_count not in res"
                        res['retweet_count'] = tweets['retweet_count']
                    solr.add([res])

错误：

Traceback (most recent call last):
      File "user.py", line 267, in <module>
        get_all_tweets(x)
      File "user.py", line 245, in get_all_tweets
        solr.add({'set':[res]})  # ==> solr
      File "/home//anaconda3/envs/TwitterINt/lib/python2.7/site-packages/pysolr.py", line 1050, in add
        solrapi=solrapi,
      File "/home//anaconda3/envs/TwitterINt/lib/python2.7/site-packages/pysolr.py", line 572, in _update
        {"Content-type": "application/json; charset=utf-8"},
      File "/home//anaconda3/envs/TwitterINt/lib/python2.7/site-packages/pysolr.py", line 463, in _send_request
        raise SolrError(error_message % (resp.status_code, solr_message))
    pysolr.SolrError: Solr responded with an error (HTTP 400): [Reason: ERROR: [doc=1059346579209936896] Error adding field 'retweet_count'='0' msg=Multiple values encountered for non multiValued copy field retweeted_count: 0]