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ModuleNotFoundError: No module named 'cryptography'

these are the Error messages I am geeting on running any of my project modules.
Traceback (most recent call last):
File "C:\Users\hsnl\BlockchainCodesTutor\Wallet.py", line 3, in <module>
import Transactions
File "C:\Users\hsnl\BlockchainCodesTutor\Transactions.py", line 2, in <module>
import Signatures
File "C:\Users\hsnl\BlockchainCodesTutor\Signatures.py", line 2, in <module>
import cryptography
ModuleNotFoundError: No module named 'cryptography'
I have already installed the cryptography module and was working perfectly until today I start getting this message that " No module named 'cryptography'".
I have again installed the cryptography as well as pip package but still showing the same error.

There might be loose versions running on your system. Please try the following:
python -m pip uninstall cryptography
python -m pip install cryptography
You can also check out this with python -m to make sure you are not using a loose pip.

You might not have cryptogtaphy installed correctly. I see you are using windows. Open commandline as an administrator and run pip install cryptography again. Enshure that the installation finishes without any errors and consider to restart your python interpreter after installation.
For further help you should post more details like the output of pip and your code leading to the error, so a more detailed answer for your problem can be given.

Try download cryptography whl from here.
Then use pip install cryptography-XXX.whl
For example:
pip install cryptography-3.3.1-cp36-abi3-win_amd64.whl
And now just supports python2.7 and python3.6.

ImportError: The 'packaging.requirements' package is required

I'm running VPS with ubuntu:
Distributor ID: Ubuntu
Description: Ubuntu 14.04.5 LTS
Release: 14.04
Codename: trusty
I tried to upgrade Python to 2.7.16 from 2.7.6.
Just after upgrade Gunicorn library failed to start with
Traceback (most recent call last):
File "/home/user/bin/python-2.7/bin/gunicorn", line 7, in <module>
from gunicorn.app.wsgiapp import run
File "/home/user/bin/python-2.7/lib/python2.7/site-packages/gunicorn/app/wsgiapp.py", line 9, in <module>
from gunicorn.app.base import Application
File "/home/user/bin/python-2.7/lib/python2.7/site-packages/gunicorn/app/base.py", line 12, in <module>
from gunicorn import util
File "/home/user/bin/python-2.7/lib/python2.7/site-packages/gunicorn/util.py", line 12, in <module>
import pkg_resources
File "/home/user/bin/python-2.7/lib/python2.7/site-packages/pkg_resources/__init__.py", line 82, in <module>
__import__('pkg_resources.extern.packaging.requirements')
File "/home/user/bin/python-2.7/lib/python2.7/site-packages/pkg_resources/extern/__init__.py", line 61, in load_module
"distribution.".format(**locals())
ImportError: The 'packaging.requirements' package is required; normally this is bundled with this package so if you get this warning, consult the packager of your distribution.
I was told that it could be some setuptools issue, so I renewed them with
python -m ensurepip
Looking in links: /tmp/tmp98U8zf
Requirement already satisfied: setuptools in ./bin/python-2.7/lib/python2.7/site-packages (41.1.0)
Requirement already satisfied: pip in ./bin/python-2.7/lib/python2.7/site-packages (19.2.2)
(no changes)
I tried to do
pip install packaging
(no changes)
or downgrade setuptools to 19.2 (as suggested in Python 2.7 The 'packaging' package is required; normally this is bundled with this package)
and got
File "/home/user/bin/python-2.7/lib/python2.7/site-packages/gunicorn/config.py", line 8, in <module>
import copy
File "/home/user/bin/python-2.7/lib/python2.7/copy.py", line 52, in <module>
import weakref
File "/home/user/bin/python-2.7/lib/python2.7/weakref.py", line 14, in <module>
from _weakref import (
ImportError: cannot import name _remove_dead_weakref
Is there any working way to upgrade to 2.7.16 python in my case?
UPD:
I upgraded python with it with
wget https://www.python.org/ftp/python/2.7.16/Python-2.7.16.tgz
make clean && ./configure --enable-unicode=ucs4 --enable-shared --prefix=/home/user/bin/python-2.7/ --with-ensurepip=install && make && make install
pip install -r ~/django/django_projects/requirements.txt
pip freeze: https://www.pastiebin.com/5d592ea701503
Thanks.

Scenario
First: When trying to execute a Python script, the following error message appears:
ImportError: The 'packaging.requirements' package is required; normally this is bundled with this package so if you get this warning, consult the packager of your distribution.
Second: When trying to check the version of setuptools with pip show setuptools (or when using any other pip command), the next error message appears:
ImportError: cannot import name _remove_dead_weakref
Reason
This is because the current Python installation is somehow screwed up. In my case the mess was caused by an upgrade from Ubuntu 16.04 to Ubuntu 18.04.
Solution
With Virtual Environment
In the best case you were already using a virtual environment (this was my case). The solution here would be to recreate/setup your venv again (step-by-step):
$ cd /path/to/your/venv
# remove your old venv
$ rm -rf ./*
# create a new one
$ /usr/bin/virtualenv . --python=YOUR-PYTHON-VERSION
# activate venv
$ source bin/activate
# verify the correct python version is installed
$ python --version
For example replace YOUR-PYTHON-VERSION with python2.7 or python3.7.
After recreating your venv the problem should be fixed and you should be able to use pip again.
Without Virtual Environment
I think the best way to fix the problem would be to completely uninstall all non-default Python versions (for example Ubuntu 18.04 comes with Python 3.6+) and then make a clean reinstall of all other Python versions needed.

Try upgrading pip by typing:
pip install --upgrade pip

ImportError: No module named _psycopg

I've looked at every post concerning this issue. I've (re)installed PostgreSQL on my Mac using Homebrew. I've adjusted the PATH variables. I've installed/uninstalled/reinstalled psycopg2. I've watched videos. Still, I cannot figure out how psycopg2 can be squarely on my machine and yet unavailable to my database and, by extension, my Flask application. Here is my latest error message with confirmation that, yes, it's there and, no, I can't use it (or Python won't acknowledge it). Any help would be greatly appreciated. This is day two of this nonsense.
RCD#Ryans-MacBook-Pro ~ - $ sudo pip3 install psycopg2
Password:
Requirement already satisfied: psycopg2 in /Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages (2.7.5)
RCD#Ryans-MacBook-Pro ~ - $ python
>>> import psycopg2
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/psycopg2/__init__.py", line 50, in <module>
from psycopg2._psycopg import ( # noqa
ImportError: No module named _psycopg

So you've installed psycopg2 into Python 3.7 but tried to use it in Python 2.7.
python and pip must be synchronized; the simplest way to do that is to run python -m pip instead of pip, that way you guarantee that you use correct pip for your current python.
Please remember that sudo uses a different $PATH so you'd better set the full path to your python:
sudo /Library/Frameworks/Python.framework/Versions/2.7/bin/python -m pip install -U psycopg2-binary

sudo install - Python 3?

I'm new to Linux and I'm trying to install packages through a Makefile so users can run my Python 3 program.
sudo pip install python3-weather-api
However, even after uninstalling a previously installed version, the package seems to be going to the 2.7 version of Python.
Requirement already satisfied: python3-weather-api in /usr/local/lib/python2.7/dist-packages
Then, when I run the program, it can't find the module (it works locally in Python 3 just fine).
SystemExit: 1
Traceback (most recent call last):
File "project.py", line 11, in <module>
from weather import Weather
ImportError: No module named 'weather'
Is there a way I can point the original installation so when I run python3 project.py it can find the module?
Thanks very much!

I would recommend you to use pyenv to manage your Python installations, but, for now, try to run:
sudo pip3 install python3-weather-api

ImportError: cannot import name 'VideoCapture'

I'm writing a quick Python script that uses VideoCapture. At the start of the script, I have this:
from skvideo.io import VideoCapture
When I run the script, I get:
Traceback (most recent call last):
File "getVids.py", line 4, in <module>
from skvideo.io import VideoCapture
ImportError: cannot import name 'VideoCapture'
When I run:
pip3 install skvideo
I get:
Collecting skvideo
Could not find a version that satisfies the requirement skvideo (from versions: )
No matching distribution found for skvideo
Any idea how to fix / where to go from here?
Thanks!

The pip package providing this python module/package is call sk-video.
pip3 install sk-video

You should try
sudo pip install sk-video
as suggested in their installation guide. http://www.scikit-video.org/stable/

This smells like an environment variable problem. You shouldn't need sudo or administrator privileges to do this.
First, make sure that you run your script inside a virtual environment:
Create a Virtualenv: virtualenv my_env
Activate it: source my_env/bin/activate
Install your requirements: pip install sk-video
Run your script: python getVids.py