redis记录

key不能有空格
在使用redis的hash type时，如果传入的是int，取回的会是str类型
i.e.
        if r1.hexists("wordcounts",keyword):
            count=r1.hget("wordcounts",keyword)
            print "===="
            print type(count)
            print count
            r1.hset("wordcounts",keyword,int(count)+1)
        else:
            r1.hset("wordcounts",keyword,1)