安装denyhosts3.1版本报错如下

Traceback (most recent call last):

File "setup.py", line 10, in <module>
from DenyHosts.util import normalize_whitespace
File "/usr/local/denyhosts/DenyHosts/util.py", line 9, in <module>
import ipaddr
ImportError: No module named ipadd

#请问这个该怎么解决