QToolTip 设置提示信息

import sys
from PyQt5.QtWidgets import (QWidget, QToolTip,
    QPushButton, QApplication)
from PyQt5.QtGui import QFont    

class Example(QWidget):

    def __init__(self):
        super().__init__()
        self.initUI()

    def initUI(self):
        #Window设置
        self.setGeometry(300, 300, 300, 200)
        self.setWindowTitle('Tooltip提示信息')
        self.setToolTip('This is a <b>Window</b>')
        self.setFont(QFont('consolas',10)) #设置整个Window内字体

        # Button设置
        btn = QPushButton('Button', self)
        btn.move(50, 50)
        btn.resize(50,30)
        #btn.setFont(QFont('simsun',12)) #仅设置Button的字体
        btn.setToolTip('This is a <b>Button</b>')

        self.show() 

if __name__ == '__main__':

    app = QApplication(sys.argv)
    ex = Example()
    sys.exit(app.exec_())