解决 No module named PyQt5.QtWebKitWidgets

原因：在 PyQt 5.6(+) 版本中, 新增 QtWebEngineWidgets 代替QtWebKitWidgets。

示例代码:
#coding: utf-8

import sys
from PyQt5.QtCore import *
from PyQt5.QtWidgets import *
from PyQt5.QtGui import *
from PyQt5.QtWebEngineWidgets import *

class MainWindow(QMainWindow):
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
self.setWindowTitle("client")
self.setWindowIcon(QIcon('icons/icon.png'))
self.resize(900, 600)
self.show()

self.browser = QWebEngineView()
url = 'https://www.baidu.com'
self.browser.load(QUrl(url))
self.setCentralWidget(self.browser)

if __name__=='__main__':
app = QApplication(sys.argv)
window = MainWindow()
window.show()
sys.exit(app.exec_())
参考文档:
http://pyqt.sourceforge.net/Docs/PyQt5/introduction.html#module-PyQt5.QtWebEngineWidgets