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ModuleNotFoundError: No module named 'wittgenstein'

I would like to use the Ripper algorithm but I am unable to import wittgenstein
The installation was successful but I cannot import it in spyder. I am using python 3.8 and pip 20.2

Please use the below command in terminal
pip install wittgenstein

ModuleNotFoundError: No module named 'connections'

I am using pybrain library. When I import
from pybrain.structure import SigmoidLayer
I get the error
ModuleNotFoundError: No module named 'connections'
I am quite confused about the installation of pybrain. I am using python 3.6 and windows 10.

How did you install pybrain and which version of python are you using?
When i install it using pip3 and try
from pybrain.structure import SigmoidLayer
i get the same error as you, i then tried to install connections via pip3.
This fails with a syntax error in connections.
I then tried it with python2:
pip2 install pybrain connections scipy
this works.
So if you are using python2 you just need this:
pip install connections

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.

ModuleNotFoundError: No module named 'ruamel'

I'm using a Kubernetes inventory builder script found here: https://github.com/kubernetes-sigs/kubespray/blob/master/contrib/inventory_builder/inventory.py
On line 36, the ruamel YML library is imported using the code from ruamel.yaml import YAML. This library can be found here: https://pypi.org/project/ruamel.yaml/
On my OSX device (Mojave 10.14.3), if I run pip list, I can clearly see the most up to date version of ruamel.yaml:
If I run pip show ruamel.yaml, I get the following output:
I'm running the script with this command: CONFIG_FILE=inventory/mycluster/hosts.ini python3 contrib/inventory_builder/inventory.py 10.0.0.1 10.0.0.2 10.0.0.4 10.0.0.5
Bizarrely, it returns the following error:
Traceback (most recent call last):
File "contrib/inventory_builder/inventory.py", line 36, in <module>
from ruamel.yaml import YAML
ModuleNotFoundError: No module named 'ruamel'
I have very little experience with Python, so don't understand how this could be failing. Have I installed the library incorrectly or something? From the documentation on the ruamel.yml project page, it looks like the script is calling the library as it should be.
Thanks in advance

In my case, I was installing this with pip3 install ruamel.yaml, and it was puting the package in /usr/local/lib/python3.9/site-packages/, but the python3 binary on the machine was pinned to Python 3.7, so trying to import that module was sending the ModuleNotFoundError message.
What helped to fix this, was to install the module with python3 -m pip install ruamel.yaml, running pip via the python3 binary makes sure it runs on the same version, in this case 3.7, and gets installed via the correct version number site-packages.

pip is set to point to the Python 2 installation. To install the library under Python 3, do pip3 install ruamel.yml.

you're using python 3 and want to use the package that is with python 2. Go to the directory where your python 3 is, navigate to Scripts and use the pip in there to install the needed library.

This helped me (adding version number to python):
CONFIG_FILE=inventory/mycluster/hosts.yaml python3.6 contrib/inventory_builder/inventory.py ${IPS[#]}

[python 3.10.x].
There is no package called ruamel.yaml
what worked is pip install ruamel-yaml

pyinstaller No module named grpc

My goal is to build an executable using pyinstaller. The python script I am trying to build imports grpc. The following is an example that illustrates the problem called hello.py.
import grpc
if __name__ == '__main__':
print "hello world"
I do pyinstaller hello.py and that produces the expected dist directory. Then I run it like ./dist/hello/hello and I get error ImportError: No module named grpc.
So then I installed grpc using pip install grpc. When I rebuild the artifact I now get error Import grpc:No module named gevent.socket.
Reading online indicated that the correct items to install were actually grpcio and grpcio-tools. So I tried pip uninstall grpc pip install grpcio and pip install grpcio-tools. Doing this and rebuilding the artifact gave me error ImportError: No module named pkg_resources. Trying to pip install pkg_resources gives error: Could not find a version that satisfies the requirement pkg_resources
Having all grpcio grpcio-tools and grpc install gives the same error: Import grpc:No module named gevent.socket
This seems like it should be a very simple task. I simply want to use pyinstaller to build an artifact that has a dependency on grpc, how do I do this?

I faced the same issue. I referred this document: gRPC
As per the documentation, first upgrade your pip to version 9 or higher.
Then use the following commands:
$ python -m pip install grpcio
$ python -m pip install grpcio-tools
It worked for me!

I am working on doing a PyInstaller/cx_freeze distributable of a python app using grpc.
Can you try adding --hidden-import=pkg_resources and see what happens?
This solved it for me