在本文中，我们将了解如何使用 PyQt5 创建银比计算器。在数学中，如果两个量中较小的量和较大量的两倍之和与较大量的比率与较大量与较小量的比率相同，则两个量属于银比。下面是白银比率计算器的外观

PyQt5 是跨平台的 GUI 工具包，一组用于 Qt v5 的 python 绑定。由于该库提供的工具和简单性，人们可以非常轻松地开发交互式桌面应用程序。下面是安装 PyQt5 的命令

pip install PyQt5

概念：以下是计算白银比例的公式

A/B = 1 + ?2

这里A是较大的长度，B是较短的长度，即长度的第二部分，A和B都应该大于零

GUI 实施步骤： 1. 创建一个显示计算器名称的标题标签 2. 创建两个单选按钮，用于在第一个和第二个长度之间进行选择 3. 创建两个旋转框供用户输入特定长度 4. 创建按钮根据黄金比例计算其他值 5. 创建一个标签以显示计算值后端实现： 1. 最初禁用所有旋转框 2. 向两个单选按钮添加相同的操作 3. 在单选按钮方法中检查哪个单选按钮被选中 4. 根据选中的单选按钮使相应的旋转框启用并禁用另一个旋转框 5. 还根据选定的单选按钮分配标志值 6. 向两个旋转框添加相同的操作 7.在旋转框动作内检查启用了哪个旋转框并将其他旋转框值设为零 8. 向按钮添加动作 9. 在按钮动作内部根据标志在银比 fo 的帮助下检查标志rmula 计算其他长度 10. 格式化计算的长度并在结果标签的帮助下显示长度

下面是实现

Python3实现

# importing libraries

from PyQt5.QtWidgets import *

from PyQt5 import QtCore, QtGui

from PyQt5.QtGui import *

from PyQt5.QtCore import *

import sys

  class Window(QMainWindow):

     def __init__(self):

        super().__init__()

         # setting title

        self.setWindowTitle("Python ")

         # width of window

        self.w_width = 400

         # height of window

        self.w_height = 430

         # setting geometry

        self.setGeometry(100, 100, self.w_width, self.w_height)

         # calling method

        self.UiComponents()

         # showing all the widgets

        self.show()

     # method for components

    def UiComponents(self):

         # creating head label

        head = QLabel("Silver Ratio Calculator", self)

         head.setWordWrap(True)

         # setting geometry to the head

        head.setGeometry(0, 10, 400, 60)

         # font

        font = QFont('Times', 15)

        font.setBold(True)

        font.setItalic(True)

        font.setUnderline(True)

         # setting font to the head

        head.setFont(font)

         # setting alignment of the head

        head.setAlignment(Qt.AlignCenter)

         # setting color effect to the head

        color = QGraphicsColorizeEffect(self)

        color.setColor(Qt.darkCyan)

        head.setGraphicsEffect(color)

          # creating a radio button

        self.length1 = QRadioButton("First Length (A)", self)

         # setting geometry

        self.length1.setGeometry(50, 90, 140, 40)

         # setting font

        self.length1.setFont(QFont('Times', 9))

         # creating a spin box

        self.l1 = QSpinBox(self)

        self.l1.setMaximum(999999)

         # setting geometry to the spin box

        self.l1.setGeometry(200, 90, 160, 40)

         # setting font

        self.l1.setFont(QFont('Times', 9))

         # setting alignment

        self.l1.setAlignment(Qt.AlignCenter)

         # creating a radio button

        self.length2 = QRadioButton("Second Length (B)", self)

         # setting geometry

        self.length2.setGeometry(50, 150, 145, 40)

         # setting font

        self.length2.setFont(QFont('Times', 9))

         # creating a spin box

        self.l2 = QSpinBox(self)

        self.l2.setMaximum(999999)

         # setting geometry to the spin box

        self.l2.setGeometry(200, 150, 160, 40)

         # setting font

        self.l2.setFont(QFont('Times', 9))

         # setting alignment

        self.l2.setAlignment(Qt.AlignCenter)

          # adding same action to all the radio button

        self.length1.clicked.connect(self.radio_method)

        self.length2.clicked.connect(self.radio_method)

         # adding same action to all the spin box

        self.l1.valueChanged.connect(self.spin_method)

        self.l2.valueChanged.connect(self.spin_method)

         # making all the spin box disabled

        self.l1.setDisabled(True)

        self.l2.setDisabled(True)

           # creating a push button

        calculate = QPushButton("Calculate", self)

         # setting geometry to the push button

        calculate.setGeometry(100, 270, 200, 40)

         # adding action to the button

        calculate.clicked.connect(self.calculate)

         # adding color effect to the push button

        color = QGraphicsColorizeEffect()

        color.setColor(Qt.blue)

        calculate.setGraphicsEffect(color)

          # creating a label to show result

        self.result = QLabel(self)

         # setting properties to result label

        self.result.setAlignment(Qt.AlignCenter)

         # setting geometry

        self.result.setGeometry(50, 330, 300, 70)

         # making it multi line

        self.result.setWordWrap(True)

         # setting stylesheet

        # adding border and background

        self.result.setStyleSheet("QLabel"

                                  "{"

                                  "border : 3px solid black;"

                                  "background : white;"

                                  "}")

         # setting font

        self.result.setFont(QFont('Arial', 11))

      # method called by the radio buttons

    def radio_method(self):

         # checking who is checked and who is unchecked

        # if first radio button is checked

        if self.length1.isChecked():

             # making first spin box enable

            self.l1.setEnabled(True)

             # making rest two spin box disable

            self.l2.setDisabled(True)

              # assigning flags

            self.check1 = True

            self.check2 = False

         elif self.length2.isChecked():

             # making second spin box enable

            self.l2.setEnabled(True)

             # making rest two spin box disable

            self.l1.setDisabled(True)

              # assigning flags

            self.check1 = False

            self.check2 = True

      def spin_method(self):

         # finding who called the method

        if self.l1.isEnabled():

             # setting current values

            self.l2.setValue(0)

          elif self.l2.isEnabled():

             # setting current values

            self.l1.setValue(0)

      def calculate(self):

            # silver ratio value

        silver = 2.414

          # if first value is selected

        if self.check1 == True:

             # getting spin box value

            A = self.l1.value()

             # calculating smaller length

            B = A / silver

         elif self.check2 == True:

             # getting spin box value

            B = self.l2.value()

             # calculating larger length

            A = B * silver

          # formatting values upto two decimal

        A = "{:.2f}".format(A)

        B = "{:.2f}".format(B)

         # setting text to the label

        self.result.setText("A = " + str(A) + ", B = " + str(B))

     # create pyqt5 app

App = QApplication(sys.argv)

 # create the instance of our Window

window = Window()

 # start the app

sys.exit(App.exec())

输出：

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