Answers for "how to test if localhost is working in python"

python localhost

# If Python version returned above is 3.X
python3 -m http.server
# On windows try "python" instead of "python3", or "py -3"
# If Python version returned above is 2.X
python -m SimpleHTTPServer

python local server command

On Ubuntu go to Commands and hit these two commands->
cd folderName
python3 -m http.server 8080