Solved with your help
#!/usr/bin/python
# -*- coding: utf-8 -*-
message = {'message1':'நாம்','message2':'செய்தி'}
a={}
for i in message.keys():
if "message" in i:
a[i]=message[i]
status="success"
print a
got output: {'message2':'செய்தி','message1':'நாம்'}
Thanks for all your help!!!!