python3 -m http.server
or if you don't want to use the default port 8000
python3 -m http.server 3333
or if you want to allow connections from localhost only
python3 -m http.server --bind 127.0.0.1
See the docs.
The equivalent Python 2 commands are
python -m SimpleHTTPServer
python -m SimpleHTTPServer 3333
There is no --bind
option.
See the Python 2 docs.