pyqt5 生成饼图并保存成图片

from PyQt5.QtWidgets import QApplication, QMainWindow
import sys
from PyQt5.QtChart import QChart, QChartView, QPieSeries, QPieSlice
from PyQt5.QtGui import QPainter, QPen
from PyQt5.QtCore import Qt
from PyQt5 import QtCore,QtGui,QtWidgets


class Window(QMainWindow):
    def __init__(self):
        super().__init__