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('..