| wps2000 |
2016-10-18 23:00 |
自己写的第4章练习题interest，兼容PYQt5+python3
import sys
from PyQt5.QtCore import *
from PyQt5.QtGui import *
from PyQt5.QtWidgets import *
class Cpinterest(QDialog):
def __init__(self, parent=None):
super(Cpinterest, self).__init__(parent)
Principal = QLabel("Principal:")
Rate = QLabel("Rate:")
Years = QLabel("Years:")
Amount = QLabel("Amount")
self.Amount_value = QLabel()
self.PrinSpinBox = QDoubleSpinBox()
self.PrinSpinBox.setRange(2000.00, 10000000.00)
self.PrinSpinBox.setSingleStep(100)
self.PrinSpinBox.setValue(2000.00)
self.PrinSpinBox.setPrefix("$")
self.RateSpinBox = QDoubleSpinBox()
self.RateSpinBox.setRange(1.00,200.00)
self.RateSpinBox.setSingleStep(0.01)
self.RateSpinBox.setValue(5.00)
self.RateSpinBox.setSuffix("%")
self.YearsComboBox = QComboBox()
self.YearsComboBox.addItem("1 year")
self.YearsComboBox.addItems(["%d years" % x
for x in range(2, 100)])
grid = QGridLayout()
grid.addWidget(Principal,0,0)
grid.addWidget(self.PrinSpinBox,0,1)
grid.addWidget(Rate,1,0)
grid.addWidget(self.RateSpinBox,1,1)
grid.addWidget(Years,2,0)
grid.addWidget(self.YearsComboBox,2,1)
grid.addWidget(Amount,3,0)
grid.addWidget(self.Amount_value,3,1)
self.setLayout(grid)
self.PrinSpinBox.valueChanged.connect(self.updateUi)
self.RateSpinBox.valueChanged.connect(self.updateUi)
self.YearsComboBox.currentIndexChanged.connect(self.updateUi)
self.setWindowTitle("Compound interest")
self.updateUi()
def updateUi(self):
year = self.YearsComboBox.currentIndex() + 1
amount = self.PrinSpinBox.value() * ((1 + (self.RateSpinBox.value() /100.0)) ** year)
self.Amount_value.setText("$ %0.2f" % amount)
app = QApplication(sys.argv)
interest = Cpinterest()
interest.show()
app.exec_()
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