Execution of dev_appserver.py for google cloud platform does not finish execution

I'm following the quickstart tutorial at this page, listed as "Go to app engine" to set up a sever where I can execute php scripts

With execution of the line

dev_appserver.py --php_executable_path=/Users/Jacob/Downloads/google-cloud-sdk/platform/php55/php-cgi $PWD

I receive the following

INFO     2018-04-03 00:13:28,447 devappserver2.py:105] Skipping SDK update check.
INFO     2018-04-03 00:13:28,562 api_server.py:265] Starting API server at: http://localhost:53815
INFO     2018-04-03 00:13:28,674 dispatcher.py:255] Starting module "default" running at: http://localhost:8080
INFO     2018-04-03 00:13:28,678 admin_server.py:152] Starting admin server at: http://localhost:8000

And execution of the command is frozen at this part. The command does not execute any further past here.

I have tried reinstalling the google cloud sdk and receive the same result. I've tried using python3 and receive the error 'ModuleNotFoundError: No module named 'setup'', for which the only solutions I've found are to use python 2.7 instead.