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libcst transformer and codemod for updating tornado @gen.coroutine syntax to python3.5+ native async/await

Project description

Tornado Async Transformer

A libcst transformer for updating tornado @gen.coroutine syntax to python3.5+ native async/await.

Check out the demo.


You can either:

  • Add tornado_async_transformer.TornadoAsyncTransformer to your existing libcst codemod.
  • Or run python -m tornado_async_transformer.tool my_project/ from the commandline.


 A simple coroutine.
 from tornado import gen

-def call_api():
-    response = yield fetch()
+async def call_api():
+    response = await fetch()
     if response.status != 200:
         raise BadStatusError()
-    raise gen.Return(
+    return

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