ImportError: No module named 'tensorflow.python'; 'tensorflow' is not a package

Problem:

I install keras and tensorflow correctly. Although both of them installed but i encounter with the following error when import keras:

  File "/root/PycharmProjects/DeepLearning/paper/test.py", line 1, in <module>
    import keras.activations
  File "/home/saeed/.conda/envs/py35/lib/python3.5/site-packages/keras/__init__.py", line 3, in <module>
    from . import utils
  File "/home/saeed/.conda/envs/py35/lib/python3.5/site-packages/keras/utils/__init__.py", line 6, in <module>
    from . import conv_utils
  File "/home/saeed/.conda/envs/py35/lib/python3.5/site-packages/keras/utils/conv_utils.py", line 9, in <module>
    from .. import backend as K
  File "/home/saeed/.conda/envs/py35/lib/python3.5/site-packages/keras/backend/__init__.py", line 89, in <module>
    from .tensorflow_backend import *
  File "/home/saeed/.conda/envs/py35/lib/python3.5/site-packages/keras/backend/tensorflow_backend.py", line 6, in <module>
    from tensorflow.python.framework import ops as tf_ops
ImportError: No module named 'tensorflow.python'; 'tensorflow' is not a package

My efforts:

I try these solutions 1, 2, 3 but no result found. Also uninstall keras and tensorflow and install again but useless.

Where is the problem?

System: Ubuntu 18.04.1 LTS

Python: 3.5

Keras: 2.2.2

Tensorflow: 1.10.0