1 QComboBox

继承自QWidget，常用信号：
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#!/usr/bin/env python
# -*- coding:utf-8 -*-
from PyQt5.QtWidgets import *
from PyQt5.QtCore import  Qt
import sys

class DemoQComboBox(QWidget):
    def __init__(self):
        super(DemoQComboBox, self).__init__()
        self.setWindowTitle("DemoQComboBox")
        self.resize(400,400)
        self.mainlayout = QVBoxLayout(self)
        #combox01
        self.combox01 = QComboBox()
        self.combox01.addItems(["星期一","星期二"])
        self.combox01.addItem("星期三")
        self.combox01.setCurrentIndex(1)  #设置当前index   0开始计算
        print("combox01 count: ",self.combox01.count() )
        print("combox01 当前index: ",self.combox01.currentIndex(), "text: ", self.combox01.currentText()  )

        #添加到布局
        self.mainlayout.addWidget(self.combox01)
        #信号槽
        self.combox01.currentIndexChanged.connect(self.combox01_currentIndexChanged_slot)
        self.combox01.currentIndexChanged[str].connect(self.combox01_indexchange_str)

    def combox01_currentIndexChanged_slot(self, index):
        print("index: ", index)

    def combox01_indexchange_str(self, text):
        print(text)

if __name__ == '__main__':
    app = QApplication(sys.argv)
    test = DemoQComboBox()
    test.show()
    sys.exit(app.exec_())

显示如下:
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2 QLineEdit

3 QSpinBox

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#!/usr/bin/env python
# -*- coding:utf-8 -*-
from PyQt5.QtWidgets import *
from PyQt5.QtCore import  Qt
import sys

class  DemoSpinBox(QWidget):
    def __init__(self):
        super(DemoSpinBox, self).__init__()
        self.setWindowTitle("QSpinBox测试")
        self.resize(300,200)
        self.mainlayout = QVBoxLayout(self)
        layout01 = QGridLayout()
        self.mainlayout.addLayout(layout01)
        layout01.addWidget(QLabel("数量"),0,0,1,1)
        self.num = QSpinBox()
        self.num.setValue(2)     #设置值
        self.num.setRange(0,100) #设置范围
        self.num.setSuffix(" kg") #显示后缀
        layout01.addWidget(self.num, 0, 1, 1, 1)
        layout01.addWidget(QLabel("单价"), 0, 2, 1, 1)
        self.price = QDoubleSpinBox()
        self.price.setValue(2.1)
        self.price.setPrefix("$ ") #显示前缀
        layout01.addWidget(self.price, 0, 3, 1, 1)
        self.btn = QPushButton("计算")
        layout01.addWidget(self.btn, 1, 0, 1, 2)
        layout01.addWidget(QLabel("总价"), 1, 2, 1, 1)
        self.totalprice = QDoubleSpinBox()
        self.totalprice.setValue(0)
        self.totalprice.setPrefix("$ ")
        layout01.addWidget(self.totalprice, 1, 3, 1, 1)
        line= QFrame()
        line.setFrameStyle(QFrame.HLine|QFrame.Plain)
        self.mainlayout.setSpacing(0)
        self.mainlayout.addWidget(line)
        #显示
        layout02 = QGridLayout()
        layout02.addWidget(QLabel("二进制显示"),0,0)
        self.bin_spin = QSpinBox()
        self.bin_spin.setPrefix("bin  ")
        self.bin_spin.setValue(8)
        self.bin_spin.setRange(0,0xFF)
        self.bin_spin.setDisplayIntegerBase(2)
        layout02.addWidget(self.bin_spin, 0, 1)
        self.mainlayout.addLayout(layout02)
        #self.mainlayout.addStretch()
        #信号槽
        self.btn.clicked.connect(self.on_btn_clicked)

    def on_btn_clicked(self):
        value = self.price.value()*self.num.value()
        self.totalprice.setValue(value)

if __name__ == '__main__':
    app = QApplication(sys.argv)
    test = DemoSpinBox()
    test.show()
    sys.exit(app.exec_())