Pycharm上的PyQt5，未使用的模块

Question

working on writing a Python script to scrape a webpage after it has run its JavaScript. I realized I needed the JS to run because using the Requests wasn't returning any data. I found what seemed to be my solution here but I am having some problems still.

First of all that tutorial uses PyQt4, I have installed and tried multiple versions of PyQt 4 and 5 from the project interpreter and still can't find a solution. Here is the relevant code:

import PyQt5.QtWebEngineWidgets
import PyQt5.QtCore
import PyQt5.QtWebEngine
import PyQt5.QtWebEngineCore


class Render(QWebpage):
    def __init__(self, url):
        self.app = QApplication(sys.argv)
        QWebPage.__init__(self)
        self.loadFinished.connect(self._loadFinished)
        self.mainFrame().load(QUrl(url))
        self.app.exec_()

    def _load_finished(self, result):
        self.frame = self.mainFrame()
        self.app.quit()

The QWebpage, QApplication, and QUrl calls all have 'Unresolved Reference' errors, the four PyQt5 import statements also all have 'Unused Import Statement' indications. I have tried for several hours to resolve these issues, uninstalling and reinstalling PyQt several times and searching the internet

Any advice would be awesome, Thanks!

Answer 1

Your imports are incorrect, in python there are many ways to do it: in your case you could be like this:

1. from package import class

---

import sys

from PyQt5.QtCore import QUrl
from PyQt5.QtWebKitWidgets import QWebPage
from PyQt5.QtWidgets import QApplication


# Take this class for granted.Just use result of rendering.
class Render(QWebPage):
    def __init__(self, url):
        self.app = QApplication(sys.argv)
        QWebPage.__init__(self)
        self.loadFinished.connect(self._loadFinished)
        self.mainFrame().load(QUrl(url))
        self.app.exec_()

    def _loadFinished(self, result):
        self.frame = self.mainFrame()
        self.app.quit()


url = 'http://pycoders.com/archive/'
r = Render(url)
result = r.frame.toHtml()
print(result)

2. import package , then you should use each element as package.class :

---

import sys
from PyQt5 import QtWebKitWidgets, QtCore, QtWidgets


class Render(QtWebKitWidgets.QWebPage):
    def __init__(self, url):
        self.app = QtWidgets.QApplication(sys.argv)
        QtWebKitWidgets.QWebPage.__init__(self)
        self.loadFinished.connect(self._loadFinished)
        self.mainFrame().load(QtCore.QUrl(url))
        self.app.exec_()

    def _loadFinished(self, result):
        self.frame = self.mainFrame()
        self.app.quit()


url = 'http://pycoders.com/archive/'
r = Render(url)
result = r.frame.toHtml()
print(result)

If you are using pycharm there is a very simple way that pycharm imports the packages correctly for you, for this you must place the dot above the word that generates the error and execute Ctrl+M

Note:If you are using windows you will not be able to use these modules since Qt and therefore PyQt, use chromium, and it seems that they have a problem with Windows.