利用Pyqt5编写简单计算器

利用Pyqt5编写简单计算器

最近学习python，用pycharm软件自带的tkinter学习做了UI界面，发现做简单的界面还行，复杂点的就很难受，特别是对于我这种学习没多久又没人带的，就只能各种摸索，然后有一天突然发现了pyqt5这个东西，感觉打开了新大陆一样，然后自己尝试学习网上的教程，自己摸索，做了一个简单的计算器的UI，话不多说，下面教程大致介绍了如何制作，稍微简略，程序部分会比较详细。

1、安装pyqt5

如何安装pyqt5和pyqt5tool这里就不赘述了，能够找到详细的教程，也比较简单。

2、打开QtDesigner设计界面

首先新建一个窗口，并且拖动所需要的功能块到窗口，设计出简单的计算器界面。
1、拖动lineEdit作为显示数字界面
2、拖动pushButton作为功能按钮，并且修改名称

3、编辑好的界面保存，并且转换成.py文件
cmd打开终端，输入指令：pyuic5 qwer.ui > calculate.py 或者指令 pyuic5 -o calculate.py qwer.ui
打开转换好的.py文件，得到一个编写好界面的class，代码如下：

# -*- coding: utf-8 -*-

# Form implementation generated from reading ui file 'qwer.ui'
#
# Created by: PyQt5 UI code generator 5.13.0
#
# WARNING! All changes made in this file will be lost!


from PyQt5 import QtCore, QtGui, QtWidgets


class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(499, 559)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.verticalLayout = QtWidgets.QVBoxLayout(self.centralwidget)
        self.verticalLayout.setObjectName("verticalLayout")
        self.lineEdit = QtWidgets.QLineEdit(self.centralwidget)
        sizePolicy = QtWidgets.QSizePolicy(QtWidgets.QSizePolicy.Expanding, QtWidgets.QSizePolicy.Fixed)
        sizePolicy.setHorizontalStretch(0)
        sizePolicy.setVerticalStretch(0)
        sizePolicy.setHeightForWidth(self.lineEdit.sizePolicy().hasHeightForWidth())
        self.lineEdit.setSizePolicy(sizePolicy)
        self.lineEdit.setMinimumSize(QtCore.QSize(10, 82))
        self.lineEdit.setObjectName("lineEdit")
        self.verticalLayout.addWidget(self.lineEdit)
        spacerItem = QtWidgets.QSpacerItem(20, 39, QtWidgets.QSizePolicy.Minimum, QtWidgets.QSizePolicy.Fixed)
        self.verticalLayout.addItem(spacerItem)
        self.gridLayout = QtWidgets.QGridLayout()
        self.gridLayout.setObjectName("gridLayout")
        self.pushButton_1 = QtWidgets.QPushButton(self.centralwidget)
        self.pushButton_1.setMinimumSize(QtCore.QSize(60, 60))
        self.pushButton_1.setMaximumSize(QtCore.QSize(60, 60))
        self.pushButton_1.setObjectName("pushButton_1")
        self.gridLayout.addWidget(self.pushButton_1, 0, 0, 1, 1)
        self.pushButton_5 = QtWidgets.QPushButton(self.centralwidget)
        self.pushButton_5.setMinimumSize(QtCore.QSize(60, 60))
        self.pushButton_5.setMaximumSize(QtCore.QSize(60, 60))
        self.pushButton_5.setObjectName("pushButton_5")
        self.gridLayout.addWidget(self.pushButton_5, 0, 1, 1, 1)
        self.pushButton_9 = QtWidgets.QPushButton(self.centralwidget)
        self.pushButton_9.setMinimumSize(QtCore.QSize(60, 60))
        self.pushButton_9.setMaximumSize(QtCore.QSize(60, 60))
        self.pushButton_9.setObjectName("pushButton_9")
        self.gridLayout.addWidget(self.pushButton_9, 0, 2, 1, 1)
        self.pushButton_13 = QtWidgets.QPushButton(self.centralwidget)
        self.pushButton_13.setMinimumSize(QtCore.QSize(60, 60))
        self.pushButton_13.setMaximumSize(QtCore.QSize(60, 60))
        self.pushButton_13.setObjectName("pushButton_13")
        self.gridLayout.addWidget(self.pushButton_13, 0, 3, 1, 1)
        self.pushButton_2 = QtWidgets.QPushButton(self.centralwidget)
        self.pushButton_2.setMinimumSize(QtCore.QSize(60, 60))
        self.pushButton_2.setMaximumSize(QtCore.QSize(60, 60))
        self