利用PyQt5制作一个豆瓣电影信息查看器

import requests  # 网络请求库
from bs4 import BeautifulSoup  # H5页面元素解析库
from fake_useragent import UserAgent  # 身份信息生成库

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

import sys

'''
独立线程处理信息爬取
'''
class DouBanWorker(QThread):
    trigger = pyqtSignal(str)
    finished = pyqtSignal(bool)

    def __init__(self, parent=None):
        super(DouBanWorker, self).__init__(parent)
        self.parent = parent
        self.url = 'https://movie.douban.com/top250?start={}&filter='
        self.working = True

    def __del__(self):
        self.working = False
        self.wait()

    def run(self):
        # 构造useragent身份设备信息
        headers = {
            "User-Agent": str(UserAgent().random),
        }
        for page in range(4):
            url = self.url.format(page * 25)
            response = requests.get(url, headers=headers)
            bs = BeautifulSoup(response.text, 'html.parser')
            movie_list = bs.find_all('div', class_='item')
            for movie in movie_list:
                movie_seq = movie.find('em').text
                movie_name = movie.find('span').text
                movie_score = movie.find("span", class_='rating_num').text
                movie_inst = movie.find("span", class_='inq').text
                movie_link = movie.find('a')['href']
                self.trigger.emit('\n')
                self.trigger.emit('排名：' + movie_seq + '\n')
                self.trigger.emit('名称：' + movie_name + '\n')
                self.trigger.emit('评分：' + movie_score + '\n')
                self.trigger.emit('描述：' + movie_inst + '\n')
                movie_link = "<font color='blue'>" + movie_link + "</font>"
                self.trigger.emit('链接：' + movie_link + '\n')
        self.finished.emit(True)

def init_ui(self):
        '''
        初始化UI界面布局
        :return:
        '''
        self.setWindowTitle('豆瓣电影排名')
        self.setWindowIcon(QIcon('电影.ico'))
        self.resize(400, 300)

        vbox = QVBoxLayout()

        self.result_brower = QTextBrowser()
        self.result_brower.setFont(QFont('宋体', 8))
        self.result_brower.setReadOnly(True)
        self.result_brower.setPlaceholderText('信息展示区域')
        self.result_brower.ensureCursorVisible()

        vbox.addWidget(self.result_brower)

        self.thread_ = DouBanWorker(self)
        self.thread_.trigger.connect(self.update_log)
        self.thread_.finished.connect(self.finished)

        self.start_btn = QPushButton()
        self.start_btn.setText('获取前100名豆瓣电影详细信息')
        self.start_btn.clicked.connect(self.start_btn_click)

        vbox.addWidget(self.start_btn)

        self.setLayout(vbox)

 def update_log(self, text):
        '''
        槽函数：向文本浏览器中写入内容
        :param text:
        :return:
        '''
        cursor = self.result_brower.textCursor()
        cursor.movePosition(QTextCursor.End)
        self.result_brower.append(text)
        self.result_brower.setTextCursor(cursor)
        self.result_brower.ensureCursorVisible()

def start_btn_click(self):
        '''
        槽函数：启动子线程爬取豆瓣电影信息
        :return:
        '''
        self.start_btn.setEnabled(False)
        self.thread_.start()

  def finished(self, finished):
        '''
        槽函数：处理完成时将开始按钮变成可点击状态
        :param finished:
        :return:
        '''
        if finished is True:
            self.start_btn.setEnabled(True)

if __name__ == '__main__':
    '''
    主函数入口
    '''
    app = QApplication(sys.argv)
    main = DouBanUI()
    main.show()
    sys.exit(app.exec_())