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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