Noob warning: trying to use pip to install pytest and pep8 in Command Prompt

[snippsat]

Look at this link.

'C:\Users\username\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.9_qbz5n2kfra8p0\LocalCache\local-packages\Python39\Scripts' which is not on PATH.

Look at link under Fixing Path if needed

For you need to add these paths in Environment Variables Path.

C:\Users\username\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.9_qbz5n2kfra8p0\LocalCache\local-packages\Python39\
C:\Users\username\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.9_qbz5n2kfra8p0\LocalCache\local-packages\Python39\Scripts\

Restart Pc.

WARNING: You are using pip version 20.2.3; however, version 20.3.3 is available.

After fixing Windows Paths,now will python and pip from work anywhere in cmd.

C:\>python -m pip install --upgrade pip
Collecting pip
  Downloading pip-20.3.3-py2.py3-none-any.whl (1.5 MB)
     |████████████████████████████████| 1.5 MB 364 kB/s
Installing collected packages: pip
  Attempting uninstall: pip
    Found existing installation: pip 20.2.4
    Uninstalling pip-20.2.4:
      Successfully uninstalled pip-20.2.4
Successfully installed pip-20.3.3

C:\>pip -V
pip 20.3.3 from c:\python38\lib\site-packages\pip (python 3.8)

C:\>

I have made a short video on how to correctly install Python modules/libraries step by step. See if it helps. Most likely the pip command line wasn't in the correct path when you run it.

Should really be fixing environment variables Path,so don't need to go into Scripts folder for using pip.
So for ease of use should python and pip main Python version work from anywhere in cmd.
py can be used to access other Python version if that's needed.

C:\                                                                                                            
λ py -3.6 -V                                                                                                   
Python 3.6.4                                                        
                                                      
C:\                                                                                                            
λ py -2.7 -V                                                                                                   
Python 2.7.9                                                                                                   
                                                                                                                
C:\                                                                                                            
λ # Using pip to install to 2.7                                                                            
λ py -2.7 -m pip install logzero                                                                               
Requirement already satisfied: logzero in c:\python27\lib\site-packages