Problem in importing ProductIO, HashMap,GPF in jupyter notebook

Hi!
I have created a new enviroment with python 3.6, in ubuntu command line, my system is having 16 GB RAM, I have tried to install snappy, I am able to import it as well but I am not able to import ProductIO, HashMap, GPF, I have tried the solutions which are already given-

$./snappy-conf /home/mrslab/anaconda3/envs/snappy/bin/python
Configuring SNAP-Python interface…
Done. The SNAP-Python interface is located in ‘/home/mrslab/.snap/snap-python/snappy’
When using SNAP from Python, either do: sys.path.append(‘/home/mrslab/.snap/snap-python’)
or copy the ‘snappy’ module into your Python’s ‘site-packages’ directory.

import snappy
from snappy import ProductIO
Traceback (most recent call last):
File “”, line 1, in
ImportError: cannot import name ‘ProductIO’
import sys
sys.path.insert(0,‘/home/mrslab/.snap/snap-python’)
sys.path.append(“/home/mrslab/.snap/snap-python”)
from snappy import ProductIO
Traceback (most recent call last):
File “”, line 1, in
ImportError: cannot import name ‘ProductIO’
from snappy import HashMap
Traceback (most recent call last):
File “”, line 1, in
ImportError: cannot import name ‘HashMap’
from snappy import GPF
Traceback (most recent call last):
File “”, line 1, in
ImportError: cannot import name ‘GPF’

What can be the possible solution for that?