Python not found

are you use Mac or Windows 

this is for Windows venv/Scripts/Activate.ps1

for Mac source  .venv/bin/activate

try this 

don't forget to create a venv file, first like this

python -m venv venv

before you Activate 

@ncash242 the error states that it doens recognize "python", please open command prompt / powershell and type the following and screenshot the result:

python --version