我将控制台结果定向输出到UI界面，文字颜色字体怎么也改不了，请高手指点下。
以下代码源自互联网，用来方便交流用：我想把 输出结果：running hello done 字号变大，换个颜色

import sys
import time
from PyQt5.QtCore import QObject, pyqtSignal, QEventLoop, QTimer
from PyQt5.QtWidgets import QMainWindow, QPushButton, QApplication, QTextEdit
from PyQt5.QtGui import QTextCursor

 
'''
控制台输出定向到Qtextedit中
'''

 

 
class Stream(QObject):
    """Redirects console output to text widget."""
    newText = pyqtSignal(str)

 
    def write(self, text):
        self.newText.emit(str(text))

 

 
class GenMast(QMainWindow):
    """Main application window."""
    def __init__(self):
        super().__init__()

 
        self.initUI()

 
        # Custom output stream.
        sys.stdout = Stream(newText=self.onUpdateText)

 
    def onUpdateText(self, text):
        """Write console output to text widget."""
        cursor = self.process.textCursor()
        cursor.movePosition(QTextCursor.End)
        cursor.insertText(text)
        self.process.setTextCursor(cursor)
        self.process.ensureCursorVisible()

 
    def closeEvent(self, event):
        """Shuts down application on close."""
        # Return stdout to defaults.
        sys.stdout = sys.__stdout__
        super().closeEvent(event)

 
    def initUI(self):
        """Creates UI window on launch."""
        # Button for generating the master list.
        btnGenMast = QPushButton('Run', self)
        btnGenMast.move(450, 50)
        btnGenMast.resize(100, 200)
        btnGenMast.clicked.connect(self.genMastClicked)

 
        # Create the text output widget.
        self.process = QTextEdit(self, readOnly=True)
        self.process.ensureCursorVisible()
        self.process.setLineWrapColumnOrWidth(500)
        self.process.setLineWrapMode(QTextEdit.FixedPixelWidth)
        self.process.setFixedWidth(400)
        self.process.setFixedHeight(200)
        self.process.move(30, 50)

 
        # Set window size and title, then show the window.
        self.setGeometry(300, 300, 600, 300)
        self.setWindowTitle('Generate Master')
        self.show()

 
    def printhello(self):
        print('hello')

 
    def genMastClicked(self):
        """Runs the main function."""
        print('Running...')
        self.printhello()
        loop = QEventLoop()
        QTimer.singleShot(2000, loop.quit)
        loop.exec_()
        print('Done.')

 

 
if __name__ == '__main__':
    # Run the application.
    app = QApplication(sys.argv)
    app.aboutToQuit.connect(app.deleteLater)
    gui = GenMast()
    sys.exit(app.exec_())

抱歉，是我用QT时对输出框做过限定导致无法更改。