Sample PyInstaller spec file for PyQt5.QtWebEngineWidgets

t.spec

# -*- mode: python -*-
# coding: utf-8

import io
import os
import os.path
import re
import sys


a = Analysis(
    [os.path.join("t.py")],
)

pyz = PYZ(a.pure, a.zipped_data)

exe = EXE(
    pyz,
    a.scripts,
    exclude_binaries=True,
    name="t",
    console=False,
    debug=False,
    strip=False,
    upx=False,
)

coll = COLLECT(exe, a.binaries, a.zipfiles, a.datas, name="t")
app = BUNDLE(
    coll,
    name="T.app",
    bundle_identifier="local.t",
)

The t.py file (requires python -m pip install pyqt5==5.11.3):

import sys

def main():
    from PyQt5.QtWidgets import QApplication
    from PyQt5.QtCore import QUrl
    from PyQt5.QtWebEngineWidgets import QWebEngineView

    url = 'https://github.com/pyinstaller/pyinstaller'
    app = QApplication(sys.argv)
    browser = QWebEngineView()
    browser.load(QUrl(url))
    browser.show()
    sys.exit(app.exec_())

main()

Compile with python -m PyInstaller t.spec --noconfirm.

The PySide2 version (python -m pip install pyside2==5.11.2):

import sys

def main():
    from PySide2.QtWidgets import QApplication
    from PySide2.QtCore import QUrl
    from PySide2.QtWebEngineWidgets import QWebEngineView

    url = 'https://github.com/pyinstaller/pyinstaller'
    app = QApplication(sys.argv)
    browser = QWebEngineView()
    browser.load(QUrl(url))
    browser.show()
    sys.exit(app.exec_())

main()