from PyQt5 import QtCore, QtGui, QtWidgets,QtPrintSupport
from PyQt5 import QPrinter
import sqlite3
运行此错误时显示：ImporterRor：无法从'pyqt5'导入名称'qprinter'任何帮助请
QPrinter是QtPrintSupport中的类，而是这样导入：
from PyQt5.QtPrintSupport import QPrinter