The latest Apple macOS Big Sur runs programs written by pyqt5, python.app Is turned on, but there is no display, the CPU utilization rate is more than 90%

Under Big Sur, python cannot run the UI file containing QT designer. Maybe it's because the system is too new.
PS: the same py file can be run by another computer (one version lower than the version of Big Sur)
python.app It's turned on, but there's no display. It's dead.
I found out again python.app When opened, python.app The CPU occupancy rate is more than 90%.