QSpinBox 사용법

import sys
from PyQt5.QtWidgets import QApplication, QWidget, QLabel, QSpinBox, QDoubleSpinBox, QVBoxLayout


class MyApp(QWidget):

    def __init__(self):
        super().__init__()
        self.initUI()

    def initUI(self):
        self.lbl1 = QLabel('QSpinBox')
        self.spinbox = QSpinBox()
        self.spinbox.setMinimum(-10)
        self.spinbox.setMaximum(30)
        # self.spinbox.setRange(-10, 30)
        self.spinbox.setSingleStep(2)
        self.lbl2 = QLabel('0')

        self.spinbox.valueChanged.connect(self.spin_value_changed)

        self.lbl3 = QLabel('QDoubleSpinBox')
        self.dspinbox = QDoubleSpinBox()
        self.dspinbox.setRange(0, 100)
        self.dspinbox.setSingleStep(0.5)
        self.dspinbox.setPrefix('$ ')
        self.dspinbox.setDecimals(1)
        self.lbl4 = QLabel('$ 0.0')

        self.dspinbox.valueChanged.connect(self.double_value_changed)

        vbox = QVBoxLayout()
        vbox.addWidget(self.lbl1)
        vbox.addWidget(self.spinbox)
        vbox.addWidget(self.lbl2)
        vbox.addWidget(self.lbl3)
        vbox.addWidget(self.dspinbox)
        vbox.addWidget(self.lbl4)
        vbox.addStretch()

        self.setLayout(vbox)

        self.setWindowTitle('QSpinBox')
        self.setGeometry(0, 0, 300, 200)
        self.show()

    def spin_value_changed(self):
        self.lbl2.setText(str(self.spinbox.value()))

    def double_value_changed(self):
        self.lbl4.setText('$ ' + str(self.dspinbox.value()))


if __name__ == '__main__':
    app = QApplication(sys.argv)
    ex = MyApp()
    sys.exit(app.exec_())