Error running endpointscfg.py get_swagger_spec

I am trying to build a project using Google Cloud Endpoints, following this guide: Quickstart for Cloud Endpoints Frameworks on App Engine.

I am stuck at the step of generating the OpenAPI configuration file, where I need to run this command:

Attempt One

$ lib/endpoints/endpointscfg.py get_swagger_spec main.EchoApi --hostname your-service.appspot.com

I get this error:

-bash: lib/endpoints/endpointscfg.py: Permission denied

Attempt Two

I have tried the same command with sudo, which returned this error:

sudo: lib/endpoints/endpointscfg.py: command not found

Attempt Three

I have tried to cd lib/endpoints to run the command from the same folder as endpointscfg.py file:

$ cd lib/endpoints
$ endpointscfg.py get_swagger_spec main.EchoApi --hostname your-service.appspot.com

usage: /Users/myName/google-cloud-sdk/platform/google_appengine/endpointscfg.py
       [-h] {get_client_lib, get_discovery_doc} ...
/Users/myName/google-cloud-sdk/platform/google_appengine/endpointscfg.py: error: argument {get_client_lib, get_discovery_doc}: invalid choice: 'get_swagger_spec' (choose from 'get_client_lib', 'get_discovery_doc')

Attempt Four

Running it with python returns a different kind of issue:

$ python lib/endpoints/endpointscfg.py get_swagger_spec main.EchoApi --hostname your-service.appspot.com

Traceback (most recent call last):
  File "lib/endpoints/endpointscfg.py", line 59, in <module>
    import _endpointscfg_setup  # pylint: disable=unused-import
  File "/Users/myName/lab/python-docs-samples/appengine/standard/endpoints-frameworks-v2/echo/lib/endpoints/_endpointscfg_setup.py", line 98, in <module>
    _SetupPaths()
  File "/Users/myName/lab/python-docs-samples/appengine/standard/endpoints-frameworks-v2/echo/lib/endpoints/_endpointscfg_setup.py", line 94, in _SetupPaths
    from google.appengine.ext import vendor
ImportError: No module named appengine.ext

Rather than running it directly, try running it with Python, a la:

python lib/endpoints/endpointscfg.py get_swagger_spec main.EchoApi --hostname your-service.appspot.com

Tried that and it just worked for me. I'll try and make this better (either by fixing the docs or applying some fix in the repo), but that might get you what you need in the interim.

I had the exact same problem and tried the same things. What worked for me was: