[PYTHON] Server Stub codegen for OpenAPI 3.0

Description

I am trying to generate python-flask server stub for OpenAPI 3.0. but unable to do so as the latest 3.0.3 as well as 3.0.4-SNAPSHOT doesn't support python for server stub generation.

Swagger-codegen version

swagger-codegen-cli-3.0.3
Also tested with : swagger-codegen-cli-3.0.4-20181226.135851-18.jar

Command line used for generation

java -jar swagger-codegen-cli-3.0.3.jar generate -i project.yaml -l python-flask -o ./project

Output:

Exception in thread "main" java.lang.RuntimeException: Can't load config class with name python Available: aspnetcore
csharp
csharp-dotnet2
dynamic-html
html
html2
java
jaxrs-cxf-client
jaxrs-cxf
inflector
jaxrs-cxf-cdi
jaxrs-spec
jaxrs-jersey
jaxrs-di
jaxrs-resteasy-eap
jaxrs-resteasy
spring
openapi
openapi-yaml
kotlin-client
kotlin-server
php
scala
scala-akka-http-server
swift3
swift4
typescript-angular

        at io.swagger.codegen.v3.CodegenConfigLoader.forName(CodegenConfigLoader.java:31)
        at io.swagger.codegen.v3.cli.SwaggerCodegen.main(SwaggerCodegen.java:96)
Caused by: java.lang.ClassNotFoundException: python
        at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:335)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
        at java.lang.Class.forName0(Native Method)
        at java.lang.Class.forName(Class.java:264)
        at io.swagger.codegen.v3.CodegenConfigLoader.forName(CodegenConfigLoader.java:29)
        ... 1 more

Are there any plans to add python server stub codegen to upcoming release? If yes, what is ETA? If not, is there any beta in which this development is going on ?

Reproduce the report with the stated Java command and project.yaml, then inspect the generator entry point in SwaggerCodegen.java and configuration loading in CodegenConfigLoader.java. Done would mean the project exposes a Python Flask server-stub generator for OpenAPI 3.0 and the command completes successfully; no test location is named in the report.