【PyQt5-Qt Designer】简易的数字键盘输入+简易计算器

参考如下键盘格式写了一个键盘输入，目前还不能进行运算，后期完善。。。

效果如下：

完整代码：

from PyQt5.QtWidgets import (QApplication,QWidget,QPushButton,QLCDNumber,QFormLayout,QLineEdit,QLabel,QGridLayout)
from PyQt5.QtGui import QFont
from PyQt5.QtCore import Qt,QTimer,QDateTime,QDate,QTime,QSize
import sys

class Example(QWidget):
    def __init__(self):
        super(Example, self).__init__()
        self.initUI()

    def initUI(self):
        self.setGeometry(300,300,330,310)
        self.setWindowTitle("数字键盘输入")
        gridLayout = QGridLayout()
        self.display = QLineEdit("")
        self.display.setFixedSize(QSize(287,40))
        self.display.setReadOnly(True)
        self.display.setAlignment(Qt.AlignRight)
        self.display.setFont(QFont("微软雅黑",14,QFont.Bold))
        gridLayout.addWidget(self.display,0,0,1,4)
        self.showNum = ""

        keys = ['Clear', '/', '*', '-',
                '', '', '', '+',
                '', '', '', '',
                '', '', '', 'Enter',
                '', '', '.', '']
        position = [(0, 0), (0, 1), (0, 2), (0, 3),
                    (1, 0), (1, 1), (1, 2), (1, 3),
                    (2, 0), (2, 1), (2, 2), (2, 2),
                    (3, 0), (3, 1), (3, 2), (3, 3),
                    (4, 0), (4, 1), (4, 2), (4, 3), ]
        for item in range(len(keys)):
            btn = QPushButton(keys[item])
            btn.setFixedSize(QSize(60, 40))
            btn.setFont(QFont("微软雅黑",12,QFont.Bold))
            btn.clicked.connect(self.btnClicked)
            if keys[item] == "+":
                gridLayout.addWidget(btn, 2, 3, 2, 1)
                btn.setFixedSize(QSize(60, 90))
            elif keys[item] == "Enter":
                gridLayout.addWidget(btn, 4, 3, 2, 1)
                btn.setFixedSize(QSize(60, 90))
            elif keys[item] == "":
                gridLayout.addWidget(btn, 5, 0, 1, 2)
                btn.setFixedSize(QSize(142, 40))
            elif keys[item] == "":
                continue
            else:
                gridLayout.addWidget(btn, position[item][0]+1, position[item][1], 1, 1)
        self.setLayout(gridLayout)

    def btnClicked(self):
        sender = self.sender()
        symbols = ["Clear","/","*","-","+","Enter"]
        if sender.text() not in symbols:
            self.showNum += sender.text()
            self.display.setText(self.showNum)
        elif sender.text() == "Clear":
            self.display.setText("")
            self.showNum = ""

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

今天完善了一下，可以进行简单的+ - * / 运算了，效果如下：

完整代码：

 from PyQt5.QtWidgets import (QApplication,QWidget,QPushButton,QLCDNumber,QFormLayout,QLineEdit,QLabel,QGridLayout)
 from PyQt5.QtGui import QFont
 from PyQt5.QtCore import Qt,QTimer,QDateTime,QDate,QTime,QSize
 import sys

 class Example(QWidget):
     def __init__(self):
         super(Example, self).__init__()
         self.initUI()

     def initUI(self):
         self.setGeometry(300,300,330,310)
         self.setWindowTitle("简易计算器")
         gridLayout = QGridLayout()
         self.display = QLineEdit("")
         self.display.setFixedSize(QSize(287,40))
         self.display.setReadOnly(True)
         self.display.setAlignment(Qt.AlignRight)
         self.display.setFont(QFont("微软雅黑",14,QFont.Bold))
         gridLayout.addWidget(self.display,0,0,1,4)
         self.showNum = ""
         self.firstNum = ""
         self.lastNum = ""

         keys = ['Clear', '/', '*', '-',
                 '', '', '', '+',
                 '', '', '', '',
                 '', '', '', 'Enter',
                 '', '', '.', '']
         position = [(0, 0), (0, 1), (0, 2), (0, 3),
                     (1, 0), (1, 1), (1, 2), (1, 3),
                     (2, 0), (2, 1), (2, 2), (2, 2),
                     (3, 0), (3, 1), (3, 2), (3, 3),
                     (4, 0), (4, 1), (4, 2), (4, 3), ]
         for item in range(len(keys)):
             btn = QPushButton(keys[item])
             btn.setFixedSize(QSize(60, 40))
             btn.setFont(QFont("微软雅黑",12,QFont.Bold))
             btn.clicked.connect(self.btnClicked)
             if keys[item] == "+":
                 gridLayout.addWidget(btn, 2, 3, 2, 1)
                 btn.setFixedSize(QSize(60, 90))
             elif keys[item] == "Enter":
                 gridLayout.addWidget(btn, 4, 3, 2, 1)
                 btn.setFixedSize(QSize(60, 90))
             elif keys[item] == "":
                 gridLayout.addWidget(btn, 5, 0, 1, 2)
                 btn.setFixedSize(QSize(142, 40))
             elif keys[item] == "":
                 continue
             else:
                 gridLayout.addWidget(btn, position[item][0]+1, position[item][1], 1, 1)
         self.setLayout(gridLayout)

     def btnClicked(self):
         sender = self.sender()
         symbols = ["Clear","/","*","-","+","Enter"]
         if sender.text() not in symbols:
             self.showNum += sender.text()
             self.display.setText(self.showNum)
         elif sender.text() == "Clear":
             self.display.setText("")
             self.showNum = ""
         elif sender.text() == "/":
             self.firstNum = self.showNum
             self.display.setText("")
             self.showNum = ""
             self.operator = "/"
         elif sender.text() == "*":
             self.firstNum = self.showNum
             self.display.setText("")
             self.showNum = ""
             self.operator = "*"
         elif sender.text() == "-":
             self.firstNum = self.showNum
             self.display.setText("")
             self.showNum = ""
             self.operator = "-"
         elif sender.text() == "+":
             self.firstNum = self.showNum
             self.display.setText("")
             self.showNum = ""
             self.operator = "+"

         elif sender.text() == "Enter":
             if self.operator == "/":
                 result = float(self.firstNum) / float(self.showNum)
                 result = float("%.2f"%result)
             elif self.operator == "*":
                 result = float(self.firstNum) * float(self.showNum)
                 result = float("%.2f" % result)
             elif self.operator == "+":
                 result = float(self.firstNum) + float(self.showNum)
                 result = float("%.2f" % result)
             elif self.operator == "-":
                 result = float(self.firstNum) - float(self.showNum)
                 result = float("%.2f" % result)
             self.display.setText(str(result))
             self.showNum = ""

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

简易计算器