在python3中，filter处理之后，变成了一个可迭代对象，解决办法有2中：
① 切成python2
② 在filter外面套一层list
df = df.dropna()
lines=df.content.values.tolist()
sentences=[]
for line in lines:
try:
segs=jieba.lcut(line)
segs = filter(lambda x:len(x)>1, segs)
segs = filter(lambda x:x not in stopwords, segs)
sentences.append(segs)
except Exception,e:
print line
continue
改成
df = df.dropna()
lines=df.content.values.tolist()
sentences=[]
for line in lines:
try:
segs=jieba.lcut(line)
segs = list(filter(lambda x:len(x)>1, segs))
segs = list(filter(lambda x:x not in stopwords, segs))
sentences.append(segs)
except Exception:
print(line)
continue