Python 3.6.9 . ImportError: No module named setuptools_rust and a Command "python setup.py egg_info" failed with error code 1

I am trying to install pyOpenSSl and it shows the following error

Requirement already satisfied: six>=1.5.2 in /home/tony/hx-preinstaller-venv/lib/python3.6/site-packages (from pyOpenSSL)Collecting cryptography>=3.3 (from pyOpenSSL)Using cached https://files.pythonhosted.org/packages/cc/98/8a258ab4787e6f835d350639792527d2eb7946ff9fc0caca9c3f4cf5dcfe/cryptography-3.4.8.tar.gzComplete output from command python setup.py egg_info:

        =============================DEBUG ASSISTANCE==========================        If you are seeing an error here please try the following to        successfully install cryptography:        Upgrade to the latest pip and try again. This will fix errors for most        users. See: https://pip.pypa.io/en/stable/installing/#upgrading-pip        =============================DEBUG ASSISTANCE==========================Traceback (most recent call last):  File "<string>", line 1, in <module>  File "/tmp/pip-build-8toyhikv/cryptography/setup.py", line 14, in <module>    from setuptools_rust import RustExtensionModuleNotFoundError: No module named 'setuptools_rust'

The command I ran:

pip install pyOpenSSL