from PyQt5.QtGui import QFont
from PyQt5.QtWidgets import *


class ChangeTheme(QLabel):
    def __init__(self):
        super(ChangeTheme, self).__init__()
        self.setScaledContents(True)
        self.widget = QWidget()
        self.label = QLabel('主题')
        layout = QVBoxLayout()
        layout.addWidget(self.label)
        self.widget.setLayout(layout)
        self.widget.show()