用PyQt5实现了界面，使用urllib实时抓取ip138.com网站的汇率信息。
import sys import urllib import urllib.request from PyQt5.QtWidgets import * class Form(QDialog): def __init__(self, parent=None): super(Form, self).__init__(parent) self.getdata() comboItems = list(self.rates.keys()) textLabel = QLabel('实时汇率查询换算') self.fromComboBox = QComboBox() self.fromComboBox.addItems(comboItems) self.fromSpinBox = QDoubleSpinBox() self.fromSpinBox.setRange(0.01, 10000000.00) self.fromSpinBox.setValue(100) self.toComboBox = QComboBox() self.toComboBox.addItems(comboItems) self.toLabel = QLabel('1.00') grid = QGridLayout() grid.addWidget(textLabel, 0, 0) grid.addWidget(self.fromComboBox, 1, 0) grid.addWidget(self.fromSpinBox, 1, 1) grid.addWidget(self.toComboBox, 2, 0) grid.addWidget(self.toLabel, 2, 1) self.setLayout(grid) self.updateUi() self.fromComboBox.currentIndexChanged.connect(self.updateUi) self.toComboBox.currentIndexChanged.connect(self.updateUi) self.fromSpinBox.valueChanged.connect(self.updateUi) self.setWindowTitle('汇率 @author : likui') def updateUi(self): from_value = self.rates[self.fromComboBox.currentText()] to_value = self.rates[self.toComboBox.currentText()] money = self.fromSpinBox.value() url = 'http://qq.ip138.com/hl.asp?from=%s&to=%s&q=%s' % ( from_value, to_value, money) html = self.urlopen(url) table_start = html.find('<table') count = 5 td_begin = html.find('<td') while count: count -= 1 td_begin = html.find('<td', td_begin + 1) temp = td_begin td_end = html.find('</td>', td_begin) amount = float(html[td_begin + 4:td_end]) self.toLabel.setText('%0.2f' % amount) def getdata(self): self.rates = {} url = 'http://qq.ip138.com/hl.asp' html = self.urlopen(url) td_begin = html.find('<td>') td_end = html.find('</td>', td_begin) resource = html[td_begin:td_end] begin = resource.find('<optgroup') end = resource.find('</optgroup>') option_begin = resource.find('<option', begin) while option_begin != -1: value = resource[option_begin + 14:option_begin + 17] value_begin = resource.find('>', option_begin) value_end = resource.find('<', value_begin) rate = resource[value_begin + 1:value_end] self.rates[rate] = value option_begin = resource.find('<option', value_end) if option_begin > end: break def urlopen(self, url): ret = urllib.request.Request(url) ret.add_header('User-Agent', 'Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) ' 'Chrome/41.0.2272.101 Safari/537.36') html = urllib.request.urlopen(ret).read().decode('GB2312') return html if __name__ == '__main__': app = QApplication(sys.argv) form = Form() form.show() app.exec_()
转载于:https://www.cnblogs.com/lkpp/p/7400036.html
相关资源：JAVA上百实例源码以及开源项目