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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

Issue installing zenipy, ModuleNotFoundError: no module named 'gi'

I'm trying to import zenipy for windows 10 after reading and experiencing that zenity-python simply will not work. So I installed zenipy and got the 'successfully installed' message from the command line but now when trying to import it I get :
ModuleNotFoundError: No module named 'gi'
in PyCharm I am writing:
from zenipy import *
Please can someone help me to import zenipy and tell me what is going wrong?

Looks like it's not installed or don't have the dependencies that need. Try pip uninstall zenipy and then pip install zenipy.
Or download and install the repo on GitHub.
$ git clone https://github.com/poulp/zenipy.git
$ cd ./zenipy
$ python setup.py install

ImportError: No module named scenedetect on Linux Ubuntu

I'm trying to use pyscenedetect library on python for videos but I get this error when using the python interface and when I use the command line interface I get the error "ModuleNotFoundError: No module named 'cv2'"
even though I believe I installed both correctly according to the documentations.
I have trying to look for different ways to import opencv for the second error but to no avail. As for the first error i can't find any answers to my problem.
import cv2
import numpy as numpy
import os
import scenedetect
from scenedetect.video_manager import VideoManager
from scenedetect.scene_manager import SceneManager
from scenedetect.frame_timecode import FrameTimecode
from scenedetect.stats_manager import StatsManager
from scenedetect.detectors import ContentDetector

If you have pip you can try
pip install opencv-python
If you have anaconoda, you can try
conda install -c conda-forge opencv
it's probable that you installed it on a different python installation in your PC.
To know where your python installation is you can launch python and:
import sys
sys.path
To get the list of everything you have installed you can:
pip freeze > installed_modules.txt
Try only running
import cv2
So that you can test it

I found the problem. As Ivan was pointing out, the problem was with openCV.
I used the following command:
sudo apt install python3-opencv

Failed to install scitools-iris using pip: ImportError No module named target_pkg (in pyke)

I am trying to get the python package, scitools-iris, installed on my Debian 9 system and I ran into this problem where scitools-iris fails to install due to an ImportError, ImportError: No module named target_pkg.
I am using python 2.7 and all packages are installed using pip only. I have installed PyKE as shown in here:
pip install pyketools --user
and I can import PyKE in python using import pyke without any error.
Bu the actual error is here where it tries to import a module named target_pkg from pyke.target_pkg. I tried the import statement in python,
from pyke.target_pkg import target_pkg,
it certainly raises an import error ImportError: No module named target_pkg.
How do I get around this problem and install iris in my system?
Have I installed the wrong package for PyKE?

Found out what I have been doing wrong. I actually had the wrong package installed for PyKE using pip. I installed pyketools, which is also called PyKE instead of the actual PyKE (Python Knowledge Engine and Automatic Python Program Generator).
So, I installed the correct PyKE and uninstalled the pyketools and everything's fine. Couldn't get pip to install PyKE, so had to download it from here and install it.

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.