PyQt5头文件的来源

from PyQt5 import QtCore, QtWidgets, QtGui
from PyQt5.QtWidgets import QApplication, QWidget, QDialog, QLabel, QLineEdit, QPushButton, QTextEdit, QStackedWidget, QComboBox
from PyQt5.QtCore import QObject, Qt, QPoint, QEvent, pyqtSignal, QFile, QResource
from PyQt5.QtGui import QPen, QCursor, QPainter, QPainterPath, QPalette, QTextDocument, QIcon, QFont