pyqt5 鼠标悬停按钮变色

以下是一个pyqt5鼠标悬停按钮变色的例子：

from PyQt5.QtWidgets import QApplication, QPushButton, QWidget
from PyQt5.QtGui import QPalette, QColor

class HoverButton(QPushButton):
    def __init__(self, parent=None):
        super(HoverButton, self).__init__(parent)
        self.setMouseTracking(True)

    def enterEvent(self, event):
        self.setStyleSheet("background-color: yellow;")

    def leaveEvent(self, event):
        self.setStyleSheet("background-color: none;")

if __name__ == '__main__':
    app = QApplication([])
    widget = QWidget()
    layout = QVBoxLayout(widget)
    button = HoverButton(widget)
    button.setText("Hover over me!")
    layout.addWidget(button)
    widget.show()
    app.exec_()

当鼠标悬停在按钮上时，按钮的背景颜色将变为黄色。当鼠标离开按钮时，按钮的背景颜色将恢复为默认值。