Python SDK Incompatibility with Cython

When executing a sample apache beam pipeline, the following error appears:

TypeError: Receiver() takes no argument

Full-stack trace: https://stackoverflow.com/questions/60052098/apache-beam-on-python-typeerror-receiver-takes-no-arguments/60058770?noredirect=1#comment106234439_60058770

The error appears to come from Cython packages/modules. However, after uninstalling Cython, the error goes away. Appears to have some sort of incompatibility with Cython.

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