各国新冠病毒病例——使用Python PyQt

在本文中，我们将了解如何创建一个 PyQt5 应用程序，该应用程序仅通过输入国家名称来告知冠状病毒病例的详细信息，即总病例、康复病例和总死亡人数。

Modules required and Installation:

PyQt5 : PyQt is a Python binding of the cross-platform GUI toolkit Qt, implemented as a Python plug-in. PyQt is free software developed by the British firm Riverbank Computing.

Requests : Requests allows you to send HTTP/1.1 requests extremely easily. There’s no need to manually add query strings to your URLs.

Beautiful Soup: Beautiful Soup is a library that makes it easy to scrape information from web pages. It sits atop an HTML or XML parser, providing Pythonic idioms for iterating, searching, and modifying the parse tree.

Implementations steps :

1. Create a non-editable combo box, set its geometry
2. Create country list which contain countries name and add it to the combo box
3. Create three labels to show information about total cases, recovered cases and death cases
4. Set geometry, alignment and border to each label
5. Add action to the combo box
6. Inside the action get the country name and scrap the data from the website with the help of requests BeautifulSoup
7. Convert the raw data into html code and then filter it to get the required output
8. Show the output the screen with the help of labels

下面是实现

# importing libraries
from PyQt5.QtWidgets import * 
from PyQt5 import QtCore, QtGui
from PyQt5.QtGui import * 
from PyQt5.QtCore import * 
from bs4 import BeautifulSoup as BS
import requests
import sys
  
  
class Window(QMainWindow):
  
    def __init__(self):
        super().__init__()
  
        # setting title
        self.setWindowTitle("Python ")
  
        # setting geometry
        self.setGeometry(100, 100, 400, 500)
  
        # calling method
        self.UiComponents()
  
        # showing all the widgets
        self.show()
  
    # method for widgets
    def UiComponents(self):
  
        # countries list // user can add other countries as well
        self.country = ["india", "us", "spain", "china", "russia", 
                            "pakistan", "nepal", "italy", "spain",
                                                   "uk", "brazil"]
  
        # creating a combo box widget
        self.combo_box = QComboBox(self)
  
        # setting geometry to combo box
        self.combo_box.setGeometry(100, 50, 200, 40)
  
        # setting font
        self.combo_box.setFont(QFont('Times', 10))
  
        # adding items to combo box
        for i in self.country:
            i = i.upper()
            self.combo_box.addItem(i)
  
        # adding action to the combo box
        self.combo_box.activated.connect(self.get_cases)
  
        # creating label to show the total cases
        self.label_total = QLabel("Total Cases ", self)
  
        # setting geometry
        self.label_total.setGeometry(100, 300, 200, 40)
  
        # setting alignment to the text
        self.label_total.setAlignment(Qt.AlignCenter)
  
        # adding border to the label
        self.label_total.setStyleSheet("border : 2px solid black;")
  
        # creating label to show the recovered cases
        self.label_reco = QLabel("Recovered Cases ", self)
  
        # setting geometry
        self.label_reco.setGeometry(100, 350, 200, 40)
  
        # setting alignment to the text
        self.label_reco.setAlignment(Qt.AlignCenter)
  
        # adding border
        self.label_reco.setStyleSheet("border : 2px solid black;")
  
        # creating label to show death cases
        self.label_death = QLabel("Total Deaths ", self)
  
        # setting geometry
        self.label_death.setGeometry(100, 400, 200, 40)
  
        # setting alignment to the text
        self.label_death.setAlignment(Qt.AlignCenter)
  
        # adding border to the label
        self.label_death.setStyleSheet("border : 2px solid black;")
  
  
    # method called by push
    def get_cases(self):
  
        # getting country name
        index = self.combo_box.currentIndex()
        country_name = self.country[index]
  
  
        # creating url using country name
        url = "https://www.worldometers.info/coronavirus/country/" + country_name + "/"
  
        # getting the request from url
        data = requests.get(url)
  
        # converting the text
        soup = BS(data.text, 'html.parser')
  
        # finding meta info for cases
        cases = soup.find_all("div", class_="maincounter-number")
  
        # getting total cases number
        total = cases[0].text
  
        # filtering it
        total = total[1: len(total) - 2]
  
        # getting recovered cases number
        recovered = cases[2].text
  
        # filtering it
        recovered = recovered[1: len(recovered) - 1]
  
        # getting death cases number
        deaths = cases[1].text
  
        # filtering it
        deaths = deaths[1: len(deaths) - 1]
  
        # show data through labels
        self.label_total.setText("Total Cases : " + total)
        self.label_reco.setText("Recovered Cases : " + recovered)
        self.label_death.setText("Total Deaths : " + deaths)
  
  
# create pyqt5 app
App = QApplication(sys.argv)
  
# create the instance of our Window
window = Window()
  
window.show()
  
# start the app
sys.exit(App.exec())

输出 ：