python – successfully protobufatured but impossible to import

I installed tensorflow 1.13.1 and protobuf 3.6.1. with success. But when I tried to import Protobuf 3.6.1, an error occurred. I used python 3.6.0

The error is given below:

importing prototypes
Traceback (most recent call last):
File "", line 1, in
ModuleNotFoundError: No module named "protobuf & # 39;

because of that, I can not import tensorflow