*TL;DR:* the dev_appserver.py tool's list of supported runtimes needs to
be updated to include the python38 runtime
*My hacky workaround/solution:*
I found and edited the runtime_factories.py file located in the gcloud
devappserver2 tool directory. On my Ubuntu 18.04 install, it was located
here:
```
/usr/lib/google-cloud-sdk/platform/google_appengine/google/appengine/tools/devappserver2/runtime_factories.py
```
I added `python38` to both `MODERN_RUNTIMES` and `FACTORIES` like this:
```
MODERN_RUNTIMES = set(['python38', 'python37', 'go111'])
FACTORIES = {
'go': go_factory.GoRuntimeInstanceFactory,
'go111': go_factory.GoRuntimeInstanceFactory,
'php55': php_factory.PHPRuntimeInstanceFactory,
'php72': php_factory.PHPRuntimeInstanceFactory,
'python': python_factory.PythonRuntimeInstanceFactory,
'python38': python_factory.PythonRuntimeInstanceFactory,
'python37': python_factory.PythonRuntimeInstanceFactory,
'python27': python_factory.PythonRuntimeInstanceFactory,
'python-compat': python_factory.PythonRuntimeInstanceFactory,
'custom': custom_factory.CustomRuntimeInstanceFactory,
}
```
Then hit save, and ran dev_appserver.py again and IT WORKED! I've also
confirmed that it's actually running python38 runtime!
@Google, please update the tool so others don't have to do this hacky
workaround! 🙏
Thank you!
On Wednesday, January 13, 2021 at 11:32:16 AM UTC-5 Boro wrote:
> I'm trying to upgrade the GAE runtime on several python projects from
> python37 to python38.
> I've used dev_appserver.py to test the apps locally before we deploy but
> I'm getting an unknown runtime error after changing the runtime to
> python38. Python 3.8 should be a supported runtime according to the appengine
> docs
> <https://cloud.google.com/appengine/docs/standard/python3/configuring-your-app-with-app-yaml>
> .
>
> I've also updated all gcloud cli components to the latest version. Is this
> just something that's been changed/deprecated and I'm just not aware of it?
> or is it actually a bug and missing from the `dev_appserver.py` tool?
>
> Any help would be appreciated! :)
>
>
> ```
> RuntimeError: Unknown runtime 'python38'; supported runtimes are 'custom',
> 'go', 'go111', 'java', 'java7', 'java8', 'php55', 'php72', 'python',
> 'python-compat',
> 'python27', 'python37'.
> ```
>
>
> Full traceback:
>
> ```
> Traceback (most recent call last):
> File "/mnt/c/Users/Admin/AppData/Local/Google/Cloud
> SDK/google-cloud-sdk/platform/google_appengine/dev_appserver.py", line 96,
> in <module>
> _run_file(__file__, globals())
> File "/mnt/c/Users/Admin/AppData/Local/Google/Cloud
> SDK/google-cloud-sdk/platform/google_appengine/dev_appserver.py", line 90,
> in _run_file
> execfile(_PATHS.script_file(script_name), globals_)
> File "/mnt/c/Users/Admin/AppData/Local/Google/Cloud
> SDK/google-cloud-sdk/platform/google_appengine/google/appengine/tools/devappserver2/devappserver2.py",
>
> line 613, in <module>
> main()
> File "/mnt/c/Users/Admin/AppData/Local/Google/Cloud
> SDK/google-cloud-sdk/platform/google_appengine/google/appengine/tools/devappserver2/devappserver2.py",
>
> line 601, in main
> dev_server.start(options)
> File "/mnt/c/Users/Admin/AppData/Local/Google/Cloud
> SDK/google-cloud-sdk/platform/google_appengine/google/appengine/tools/devappserver2/devappserver2.py",
>
> line 373, in start
> options.api_host, apiserver.port, wsgi_request_info_)
> File "/mnt/c/Users/Admin/AppData/Local/Google/Cloud
> SDK/google-cloud-sdk/platform/google_appengine/google/appengine/tools/devappserver2/dispatcher.py",
>
> line 259, in start
> ssl_port)
> File "/mnt/c/Users/Admin/AppData/Local/Google/Cloud
> SDK/google-cloud-sdk/platform/google_appengine/google/appengine/tools/devappserver2/dispatcher.py",
>
> line 396, in _create_module
> ssl_port=ssl_port)
> File "/mnt/c/Users/Admin/AppData/Local/Google/Cloud
> SDK/google-cloud-sdk/platform/google_appengine/google/appengine/tools/devappserver2/module.py",
>
> line 1313,
> in __init__
> super(AutoScalingModule, self).__init__(**kwargs)
> File "/mnt/c/Users/Admin/AppData/Local/Google/Cloud
> SDK/google-cloud-sdk/platform/google_appengine/google/appengine/tools/devappserver2/module.py",
>
> line 599, in __init__
> self._module_configuration)
> File "/mnt/c/Users/Admin/AppData/Local/Google/Cloud
> SDK/google-cloud-sdk/platform/google_appengine/google/appengine/tools/devappserver2/module.py",
>
> line 226, in _create_instance_factory
> sorted(repr(k) for k in runtime_factories.FACTORIES))))
> RuntimeError: Unknown runtime 'python38'; supported runtimes are 'custom',
> 'go', 'go111', 'java', 'java7', 'java8', 'php55', 'php72', 'python',
> 'python-compat',
> 'python27', 'python37'.
> ```
>
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