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Issues with vartest package - Python

I tried to install the vartests package in Python with the following command:
pip install vartests
and, by using pip list, it shows that the package is installed.
However, by importing the module I receive the following error message:
import vartests
ModuleNotFoundError: No module named 'vartests'
Do you know why it's not working?
Many thanks

ModuleNotFoundError: No module named 'pip' in spyder

I tried to use torch in spyder but I got error ModuleNotFoundError: No module named 'torch' so I tried use pip module not in cmd but in spyder itself following
import pip
pip.main(["install","torch"])
but got ModuleNotFoundError: No module named 'pip' and I know I had successfully used it in spyder before but recent automatic spyder updates probably have caused this error so I tried to install pip in my all python environments in cmd with cd {environment_path}but the pip was installed there. I also used python -m ensurepip in all environments but I still get ModuleNotFoundError: No module named 'pip'.

seems the problem is caused by reseting spyder(maybe there other causes) changing different python interpreters (environments) also is no help!! and installing or reinstalling with windows installer solved problem for me.
update: after restarting again many modules like 'pip', 'torch' and 'keyboard' are not recognized and reinstalling is no answer(no difference between installing for 'this user' or 'all users').

ModuleNotFoundError: No module named 'data_engine'

I am following a tutorial in keras but i am getting the error which i could not find the
documentation online
ModuleNotFoundError: No module named 'data_engine'
What is the problem here does that mean this library is not exist or what?

It means you didn't include the module named 'data_engine', you need to include it at the header of your python script.

Try executing on command prompt
pip install data_engine
or
python3 -m pip install data_engine

Why am i getting ModuleNotFoundError: No module named 'scipy'?

I wrote the following python line import scipy.io then I went to that folder's location in the cmd:
C:\Users\me\PycharmProjects\test>
and typed pip install scipy apparently it installed the dependencies then I went back to pycharm, ran my code and got error
ModuleNotFoundError: No module named 'scipy'
I'm just starting off with python I'm on windows 10.

PyCharm has a GUI for managing which python installation you use and packages installed:
https://www.jetbrains.com/help/pycharm/installing-uninstalling-and-upgrading-packages.html

Importing universe

I am trying to use OpenAI and I got a import error about universe on Jupyter notebook :
import gym
import universe
No module named 'universe'
When it comes to working on terminal, it returns this error
No module named 'twisted.internet'
Then I also had install twisted with pip, I got this next error :
No module named 'ujson'
and after install ujson, I got a error No module named 'go_vncdriver' again.
I think that I will get other error again.
So which way to install is most convenient ?
Could I install all packages at once ?
préferably, using pip install.
I am using OSX and python3.6.

Try installing,
pip install go_vncdriver
And check again.