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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

ModuleNotFoundError: No module named 'websocket' even though I installed pip install websocket

I am trying to run some code that has 'import websocket' however I am getting the error: ModuleNotFoundError: No module named 'websocket'
I have Python 3.7.3 and I am running in Spyder (if that makes a difference).
So from other questions/answers I found on here, in my cmd I ran pip install websocket and then also pip install websocket-client when the first one didn't run.
I am still getting the ModuleNotFoundError. Does it matter the location/folder of the code or where I install the pip command in cmd?
My python code starts with these import statements:
import json
import websocket
import traceback
import helper
import ssl
import time as time
import pandas as pd
import numpy as np
import matplotlib.pyplot as plt
from scipy.interpolate import griddata
from mpl_toolkits.mplot3d import Axes3D
In cmd I ran:
C:\Users\myname>pip install websocket
and also:
C:\Users\myname>pip install websocket-client
The error I am getting is:
File "C:/Users/micki/Downloads/Derbit-Volatility-Visulization-master/Derbit-Volatility-Visulization-master/Volatility Surface Class.py", line 2, in <module>
import websocket
ModuleNotFoundError: No module named 'websocket'

Not sure, as you did not cover how you installed and are using Spyder, though I think it is probably an issue with your environment. You might also find that you are missing the module "helper" as well. There's two easy options as follows:
If you installed and are using Spyder via conda or anaconda, follow their documentation on installing websocket-client to the correct environment found here.
The second option (the preferred option IMHO, as you can use any IDE or text editor going forward), regardless of how you installed Spyder, would be to create a python virtual environment python3 -m venv /path/to/new/virtual/environment, pip install all your dependencies in said environment, then link Spyder's interpreter to the interpereter that was installed when you made the environment. In Spyder, go to Tools -> Preferences -> Python interpreter -> check the "Use the following Python interpreter:" radio button and enter the path to the interpreter from the environment you just created. For reference, see docs on making and using a python venv here.

If the websocket and websocket-client doesn't work, try:
pip install websocket_client

This solved my issue:
sudo pip install websocket-client

Unable to import PyPDF2 module in Python 3.6.0 Shell

I am receiving following error within Python 3.6.0 IDLE Shell
ModuleNotFoundError: No module named 'PyPDF2'
This occurs even after I have run the command python -m pip install --user pyPDF2 within the Command Prompt successfully.
I have tried running import sys followed by print(sys.path) which returns several file paths, however, none of them appear to be PyPDF2.

Perhaps you should use pip3 since your using python 3.6 I just did the following on my system:
pip3 install pypdf2
and then tested that it worked with the following import statement:
from PyPDF2 import PdfFileReader

Cannot import FactorAnalyzer from module factor-analyzer-0.2.2

I installed the module factor-analyzer-0.2.2 but cannot import the function. My code is from factor_analyzer import FactorAnalyzer. I'm getting an error ModuleNotFoundError: No module named 'factor_analyzer'.
I'm using Python 3.6 and Jupyter notebook. Do you know why this does not work?
Thank you!!

I had the same problem on Mac (python3). I launch Spyder 3.3.3 via Anaconda.
In response to the following code:
from factor_analyzer import FactorAnalyzer
I received the following error:
ModuleNotFoundError: No module named 'factor_analyzer'
So, I opened Terminal (equivalent of Command Prompt on windows) and typed:
pip install factor_analyzer
Then, the problem was resolved.

Use the anaconda prompt to run the pip install factor-analyzer rather than termainal or powershell. I had the same problem and doing that solved it for me.

Can you try to run the import command on your Python Shell and let us know if you are able to import it successfully?

Python - Can't import Seaborn

I'm running iPhyton Notebooks and I'm trying to import the Seaborn package. When I try to import it from the Terminal, it loads up fine, but when I import it through iPython Notebooks, it give me the following error.
I have even tried to re-install Seaborn using both Conda and Pip inside iPython notebooks and still it wont work.
Any idea why?
Thanks.
ImportError Traceback (most recent call last)
<ipython-input-1-417274a1ae6c> in <module>()
1 get_ipython().system(u'conda install seaborn')
2 get_ipython().system(u'pip install seaborn')
----> 3 import seaborn as sb
4
ImportError: No module named seaborn

Try this
import sys
print sys.path
sys.path.append('<path to package in your syste>')
import seaborn
In my Ubuntu 14.4LTS the packages get installed in the following folder
/usr/local/lib/python2.7/dist-packages
So I simply add the package path at run time

Donit install Ipython on all your system. Install it only in the environments you want it. Otherwise Ipython will look for modules in the default path instead of the environment's path.
This is probably where your ipython is looking:
/home/user/anaconda2/lib/python2.7/
It should be looking for modules here:
/home/user/anaconda2/envs/name-of-env/lib/python3.4/
To check the path you type:
import sys
sys.path

Try entering the following in your terminal:
conda install seaborn
It will install seaborn and make it available for you to import into your notebook

Open anaconda prompt and Type
pip install seaborn