explain what parts of the code do and why. import sys from PyQt5.QtCore import * from PyQt5.QtWidgets import * from PyQt5.QtWebEngineWidgets import * class MainWindow(QMainWindow): def init(self): super(MainWindow, self).init() self.browser = QWebEngineView() self.browser.setUrl(QUrl('http://google.com')) self.setCentralWidget(self.browser) self.showMaximized() navbar = QToolBar() self.addToolBar(navbar) back_btn = QAction('Back', self) back_btn.triggered.connect(self.browser.back) navbar.addAction(back_btn) forward_btn = QAction('Forward', self) forward_btn.triggered.connect(self.browser.forward) navbar.addAction(forward_btn) reload_btn = QAction('Reload', self) reload_btn.triggered.connect(self.browser.reload) navbar.addAction(reload_btn) home_btn = QAction('Home', self) home_btn.triggered.connect(self.navigate_home) navbar.addAction(home_btn) self.url_bar = QLineEdit() self.url_bar.returnPressed.connect(self.navigate_to_url) navbar.addWidget(self.url_bar) self.browser.urlChanged.connect(self.update_url) def navigate_home(self): self.browser.setUrl(QUrl('http://programming-hero.com')) def navigate_to_url(self): url = self.url_bar.text() self.browser.setUrl(QUrl(url)) def update_url(self, q): self.url_bar.setText(q.toString()) app = QApplication(sys.argv) QApplication.setApplicationName('My Cool Browser') window = MainWindow() app.exec_(

Computer Networking: A Top-Down Approach (7th Edition)

7th Edition

ISBN:9780133594140

Author:James Kurose, Keith Ross

Publisher:James Kurose, Keith Ross

Chapter1: Computer Networks And The Internet

Section: Chapter Questions

Problem R1RQ: What is the difference between a host and an end system? List several different types of end...

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explain what parts of the code do and why.

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

class MainWindow(QMainWindow):
def __init__(self):
super(MainWindow, self).__init__()

self.browser = QWebEngineView()

self.browser.setUrl(QUrl('http://google.com'))

self.setCentralWidget(self.browser)

self.showMaximized()

navbar = QToolBar()

self.addToolBar(navbar)

back_btn = QAction('Back', self)

back_btn.triggered.connect(self.browser.back)

navbar.addAction(back_btn)
forward_btn = QAction('Forward', self)
forward_btn.triggered.connect(self.browser.forward)
navbar.addAction(forward_btn)

reload_btn = QAction('Reload', self)
reload_btn.triggered.connect(self.browser.reload)
navbar.addAction(reload_btn)

home_btn = QAction('Home', self)

home_btn.triggered.connect(self.navigate_home)
navbar.addAction(home_btn)

self.url_bar = QLineEdit()

self.url_bar.returnPressed.connect(self.navigate_to_url)

navbar.addWidget(self.url_bar)
self.browser.urlChanged.connect(self.update_url)

def navigate_home(self):

self.browser.setUrl(QUrl('http://programming-hero.com'))

def navigate_to_url(self):

url = self.url_bar.text()
self.browser.setUrl(QUrl(url))

def update_url(self, q):
self.url_bar.setText(q.toString())

app = QApplication(sys.argv)
QApplication.setApplicationName('My Cool Browser')
window = MainWindow()
app.exec_()