Hi @yxhao and thanks for your query. The Python bindings you refer to are part of the Tobii Pro SDK which by default will not operate in conjunction with the Tobii 4C Consumer level eye tracker.
In order to get the 4C to work with the Pro SDK you need to purchase a special unlock file for which you can obtain a quote by email the SDK Licencing Sales department directly at [email protected]
Alternatively, if you are comfortable with .NET, you may freely use the Tobii Core SDK which operates without restriction on the 4C.
To get started, checkout our guide @ https://developer.tobii.com/consumer-eye-trackers/core-sdk/getting-started/
with sample applications available @ https://github.com/Tobii/CoreSDK
Any further questions, please don’t hesitate to get in touch again.