Rounded framless window with no shadow

[Jake4353]

im trying to make a desktop widget and i cant seem to make a frameless window that has no shadow, with rounded borders.
When i try to remove the shadow from the window, it removes the rounded border too.

[AlexZhu2001]

Please show your code about how to disable the shadow and your environment (OS, Python version, PyQt/PySide Version etc.).
This can help us reproduce this problem.