[Python] AttributeError: keras.backend has no attribute 'eager'

I'm using python 3.8.2 , keras 2.3.1 and tensorflow 2.2.0rc4 . just with the following code :

import keras
from keras.models import sequential


I have this error :

AttributeError: partially initialized module 'keras.backend' has no attribute
'eager' (most likely due to a circular import)


if I use :

import tensorflow


or

from tensorflow.keras import ....


new error:

AttributeError: partially initialized module 'tensorflow.python.framework.ops' has
no attribute 'register_tensor_conversion_function' (most likely due to a circular
import)


full traceback:

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