Python No module named testtools

How to install testtools module for python in Linux (RHEL 7/Fedora/Centos)?

(venv) $ python -m testtools.run 
/home/stack/venv/bin/python: No module named testtools

How to install testtools module for python in RHEL 7/Fedora/Centos?

(venv) $ pip install testtools
DEPRECATION: Python 2.7 reached the end of its life on January 1st, 2020. Please upgrade your Python as Python 2.7 is no longer maintained. A future version of pip will drop support for Python 2.7. More details about Python 2 support in pip, can be found at https://pip.pypa.io/en/latest/development/release-process/#python-2-support
Collecting testtools
  Using cached testtools-2.3.0-py2.py3-none-any.whl (184 kB)
Collecting extras>=1.0.0
  Using cached extras-1.0.0-py2.py3-none-any.whl (7.3 kB)
Requirement already satisfied: six>=1.4.0 in /home/stack/venv/lib/python2.7/site-packages (from testtools) (1.14.0)
Collecting pbr>=0.11
  Using cached pbr-5.4.4-py2.py3-none-any.whl (110 kB)
Collecting traceback2
  Using cached traceback2-1.4.0-py2.py3-none-any.whl (16 kB)
Collecting unittest2>=1.0.0
  Using cached unittest2-1.1.0-py2.py3-none-any.whl (96 kB)
Collecting python-mimeparse
  Using cached python_mimeparse-1.6.0-py2.py3-none-any.whl (6.1 kB)
Collecting fixtures>=1.3.0
  Using cached fixtures-3.0.0-py2.py3-none-any.whl (67 kB)
Collecting linecache2
  Using cached linecache2-1.0.0-py2.py3-none-any.whl (12 kB)
Collecting argparse
  Using cached argparse-1.4.0-py2.py3-none-any.whl (23 kB)
Installing collected packages: extras, pbr, linecache2, traceback2, argparse, unittest2, python-mimeparse, fixtures, testtools
Successfully installed argparse-1.4.0 extras-1.0.0 fixtures-3.0.0 linecache2-1.0.0 pbr-5.4.4 python-mimeparse-1.6.0 testtools-2.3.0 traceback2-1.4.0 unittest2-1.1.0

Let's try running the test scripts again using testtools,

(venv) $ python -m testtools.run  
Tests running...
...

Great!, now worked.

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