为什么它不能在excel上下载tweet？

Question

texto=[]
date=[]

api = tweepy.API(auth)

uno = tweepy.Cursor (api.search,q=`Bocconi`, rpp=100, result_type="recent",          include_entities=True, lang="it").items()


for i in uno:

    o = i.text
    g = str(o).replace('\n',' ').replace('\r\n', ' ').replace('%\n%', ' ').replace('\r', ' ').replace('%\r%', ' ').replace('%\r\n%', ' ') 

    texto.append(g)
    e=i.created_at
    date.append(e) 

Bocconi = pd.DataFrame(index=range(0,len(texto)))

Bocconi['texto']=texto
Bocconi['date']=date

Bocconi.to_csv("Bocconi.csv",sep='\t')

我得到一个具体的失败：

return codecs.charmap_encode(input,errors,encoding_table) UnicodeEncodeError: 'charmap' codec can't encode character u'\u2714' in position 0: character maps to undefined> -