03修复，更新注释以反映PySide6的懒加载特性，并优化子类递归显示函数 - #10
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from PySide6 import QtWidgets
PySide6 现在懒加载，类不被访问，就不会出现在
__subclasses__()。__subclasses__()做 Qt 继承树遍历这个写法，现在已经不太靠谱，属于旧教程遗留强制引用几个子类，触发加载到内存
_ = QtWidgets.QPushButton
_ = QtWidgets.QRadioButton
_ = QtWidgets.QCheckBox
_ = QtWidgets.QToolButton
def get_sub_classes(class_):
for subclass in class_.subclasses():
print(subclass)
get_sub_classes(subclass)
app = QtWidgets.QApplication([])
get_sub_classes(QtWidgets.QAbstractButton)