forked from loafle/openapi-generator-original
* python: several typing and style improvements The generated (python) code fails with several standard validation tools, including `flake8`, `mypy`, and `autoflake`. While fixing every possible violation -- especially wrto typing -- woudl be a project, some of the changes are fairly easy. - The `autoflake` tool picks up on unused imports. These can just be removed. - The `mypy` tool picks up on numerious typing violations, especially if set to its strictest mode. As a starting point, all functions ought to annotate a return type, including constructors, even if the return type is `None` because otherwise the functions are omitted from type checking and it's impossible to make incremental progress towards adding types. - The `flake8` tool mostly finds whitespace and line-length issues; while line-length standards very, the source already includes several flake8 ignores, so it seems safe to add a few more. * Add generated files * Restore imports used by `AbstractPythonCodegen.java` * Update generated files