import sys
import urllib2
from PyQt4 import QtCore
from PyQt4 import QtGui
class Form(QtGui.QDialog):
def __init__(self, parent=None):
super(Form, self).__init__(parent)
date = self.getdata()
rates = sorted(self.rates.keys())
dateLabel = QtGui.QLabel(date)
self.fromComboBox = QtGui.QComboBox()
self.fromComboBox.addItems(rates)
self.fromSpinBox = QtGui.QDoubleSpinBox()
self.fromSpinBox.setRange(0.01, 10000000.00)
self.fromSpinBox.setValue(1.00)
self.toComboBox = QtGui.QComboBox()
self.toComboBox.addItems(rates)
self.toLabel = QtGui.QLabel("1.00")
grid = QtGui.QGridLayout()
grid.addWidget(dateLabel, 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.connect(self.fromComboBox,
QtCore.SIGNAL("currentIndexChanged(int)"), self.updateUi)
self.connect(self.toComboBox,
QtCore.SIGNAL("currentIndexChanged(int)"), self.updateUi)
self.connect(self.fromSpinBox,
QtCore.SIGNAL("valueChanged(double)"), self.updateUi)
self.setWindowTitle("Currency")
def updateUi(self):
to = unicode(self.toComboBox.currentText())
from_ = unicode(self.fromComboBox.currentText())
amount = ((self.rates[from_] / self.rates[to]) *
self.fromSpinBox.value())
self.toLabel.setText("{0:.2f}".format(amount))
def getdata(self): # Idea taken from the Python Cookbook
self.rates = {}
try:
date = "Unknown"
fh = urllib2.urlopen("http://www.bankofcanada.ca"
"/en/markets/csv/exchange_eng.csv")
for line in fh:
line = line.rstrip()
if not line or line.startswith(("#", "Closing ")):
continue
fields = line.split(",")
if line.startswith("Date "):
date = fields[-1]
else:
try:
value = float(fields[-1])
self.rates[unicode(fields[0])] = value
except ValueError:
pass
return "Exchange Rates Date: " + date
except Exception, e:
return "Failed to download:\n{0}".format(e)
app = QtGui.QApplication(sys.argv)
form = Form()
form.show()
app.exec_()
