ImportError: No module named grove.gpio

Hello,
I am trying on setup DHT22 sensors on Pi. I received the following error. Following the process as descibed on Seed DHT22 folder. I entered the following line command
python dht_simpleread.py
and the error below
Traceback (most recent call last):
File “dht_simpleread.py”, line 2, in
import seeed_dht
File “build/bdist.linux-armv7l/egg/seeed_dht.py”, line 14, in

Any suggestions where it