installing openpyxl

[snippsat]

Take a look at Python 3.6/3.7 and pip installation under Windows
Just the same for 3.8 if you use that,so all in done bye pip.

# Install
C:\>pip install openpyxl
Collecting openpyxl .....
Successfully built openpyxl
Installing collected packages: openpyxl
Successfully installed openpyxl-3.0.3
WARNING: You are using pip version 19.3.1; however, version 20.0.2 is available.
You should consider upgrading via the 'python -m pip install --upgrade pip' command.

# Upgrade pip
C:\>python -m pip install --upgrade pip
Collecting pip ..... 
      Successfully uninstalled pip-19.3.1
Successfully installed pip-20.0.2

# Test pip,see that's it's 20.0.2
C:\>pip -V
pip 20.0.2 from c:\python37\lib\site-packages\pip (python 3.7)

# Test that openpyxl work
C:\>python
Python 3.7.3 (v3.7.3:ef4ec6ed12, Mar 25 2019, 21:26:53) [MSC v.1916 32 bit (Intel)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import openpyxl
>>>
>>> openpyxl.__version__
'3.0.3'
>>> exit()
C:\>

Quick demo virtual environment as mention bye @gruntfutuk.

# Make environment
E:\div_code
λ python -m venv my_env

# Cd in
E:\div_code
λ cd my_env\

# Activate 
E:\div_code\my_env
λ E:\div_code\my_env\Scripts\activate

# Install
(my_env) E:\div_code\my_env
λ pip install openpyxl
Collecting openpyxl .....
Successfully installed et-xmlfile-1.0.1 jdcal-1.4.1 openpyxl-3.0.3

# Show
(my_env) E:\div_code\my_env
λ pip show openpyxl
Name: openpyxl
Version: 3.0.3
Summary: A Python library to read/write Excel 2010 xlsx/xlsm files
Home-page: https://openpyxl.readthedocs.io
Author: See AUTHORS
Author-email: [email protected]
License: MIT
Location: e:\div_code\my_env\lib\site-packages
Requires: jdcal, et-xmlfile
Required-by:

It's now a isolated environment,like a new Python version not touching your main installation.