Python _PyQt5 【总】

http://www.cnblogs.com/archisama/p/5442071.html

• QtCore
• QtGui
• QtWidgets
• QtMultimedia
• QtBluetooth
• QtNetwork
• QtPositioning
• Enginio
• QtWebSockets
• QtWebKit
• QtWebKitWidgets
• QtXml
• QtSvg
• QtSql
• QtTest

import sys
from PyQt5.QtWidgets import QApplication,QWidget,QHBoxLayout,QVBoxLayout,QSlider
from PyQt5.QtGui import QPainter,QColor,QFont,QPen,QBrush
from PyQt5.QtCore import QObject,pyqtSignal,Qt

#自定义信号
class mySignal(QObject):
    mysignal=pyqtSignal(int)
#自定义烧录组件
class myWidget(QWidget):
    def __init__(self):
        super().__init__()
        #定义默认属性
        self.value=75
        self.__num=[75,150,225,300,375,450,525,600,675]
        #界面显示委托给initUI
        self.initUI()
    def initUI(self):
        self.setMinimumSize(75,30)
    #定义属性设置方法 在此处用来设置value属性
    def setValue(self,value):
        self.value=value
        #可以根据情况使用重绘方法
        self.repaint()
    #组件界面绘制
    def paintEvent(self, e):
        #计算基础绘制数据
        size=self.size()#获取当前组件的尺寸属性
        w=size.width()#获取当前组件的宽度
        h=size.height()  # 获取当前组件的高度
        full=int(round(w/750*700))#full为最大刻录数据
        till=int(round(w/750*self.value))#till为实际刻录数据
        step=int(round(w/10))#计算刻度单位长度
        p=QPainter()#定义绘图接口对象
        p.begin(self)
        #绘制底部色块
        #1、绘制黄色块
        pen=QPen(QColor(255,255,255),1,Qt.SolidLine)
        brush=QBrush(QColor(254,254,180))
        if till>=full:
            p.setPen(pen)
            p.setBrush(brush)
            p.drawRect(0,0,full,h)
            #以下部分更换画刷绘制烧毁色块
            brush = QBrush(QColor(255,0,0))
            p.setBrush(brush)
            p.drawRect(full, 0, till-full, h)
        else:
            p.setPen(pen)
            p.setBrush(brush)
            p.drawRect(0, 0, till, h)
        #以下绘制边框
        pen = QPen(QColor(25, 25, 25), 1, Qt.SolidLine)
        brush = QBrush(Qt.NoBrush)
        p.setPen(pen)
        p.setBrush(brush)
        p.drawRect(0, 0, w-1, h-1)
        #以下绘制刻度及文字
        j=0#定义刻度索引值
        font=QFont('微软雅黑',7,QFont.Light)#定义字体
        p.setFont(font)#设置绘制字体
        for i in range(step,10*step,step):
            p.drawLine(i,0,i,5)
            m=p.fontMetrics()
            fw=m.width(str(self.__num[j]))
            p.drawText(i-fw/2,h/2,str(self.__num[j]))
            j+=1
#自定组件使用示例
class myWin(QWidget):
    def __init__(self):
        super().__init__()
        self.initUI()

    def initUI(self):
        #自定组件实例化（使用）
        self.wid=myWidget()
        self.c=mySignal()#实例化自定义信号类
        self.s=QSlider(Qt.Horizontal,self)
        self.s.setRange(1,750)#设置滑块的取值范围
        self.c.mysignal[int].connect(self.wid.setValue)
        self.s.valueChanged[int].connect(self.wid.setValue)

        #布局
        hbox=QHBoxLayout()
        hbox.addWidget(self.wid)
        vbox=QVBoxLayout()
        vbox.addWidget(self.s)
        vbox.addStretch(1)
        vbox.addLayout(hbox)

        self.setLayout(vbox)
        self.setGeometry(100,100,400,300)
        self.setWindowTitle('自定义控件使用')
        self.show()

    def valueChange(self,value):
        self.c.mysignal.emit(value)
        self.wid.repaint()
if __name__ == '__main__':

    app = QApplication(sys.argv)
    ex = myWin()
    sys.exit(app.exec_())

俄罗斯方块

"""
俄罗斯方块
 
author: wolfstar
last edited: 2018年1月
"""
import sys, random
from PyQt5.QtWidgets import QMainWindow, QFrame, QDesktopWidget, QApplication
from PyQt5.QtCore import Qt, QBasicTimer, pyqtSignal
from PyQt5.QtGui import QPainter, QColor
 
#主界面类 
class Tetris(QMainWindow):
    def __init__(self):
        super().__init__()
 
        self.initUI()
 
    def initUI(self):
        #Board创建一个面板类的实例，并设置应用程序的核心部件。
        self.tboard = Board(self)
        self.setCentralWidget(self.tboard)
        #创建一个状态栏将显示消息。我们将显示三种可能的消息:已删除的行数,停顿了一下消息,或游戏结束的消息。msg2Statusbar是一个自定义的信号,在Board 中实现类。showMessage()是一个内置的方法,在状态栏显示一条消息。 
        self.statusbar = self.statusBar()
        self.tboard.msg2Statusbar[str].connect(self.statusbar.showMessage)
        #这一行代码启动游戏
        self.tboard.start()
 
        self.resize(180, 380)
        self.center()
        self.setWindowTitle('Tetris')
        self.show()
    #窗体居中显示方法 
    def center(self):
        screen = QDesktopWidget().screenGeometry()
        size = self.geometry()
        self.move((screen.width() - size.width()) / 2,
                  (screen.height() - size.height()) / 2)
 
#创建面板类
class Board(QFrame):
    #创建一个自定义的信号。当我们想写一个信息或状态栏的分数的时候，msg2Statusbar发出一个信号
    msg2Statusbar = pyqtSignal(str)
    #这些都是Board的类变量。BoardWidth和BoardHeight定义的块的大小。Speed定义了游戏的速度。每个300 ms将开始一个新游戏循环。
    BoardWidth = 10
    BoardHeight = 22
    Speed = 300
 
    def __init__(self, parent):
        super().__init__(parent)
 
        self.initBoard()
    #我们在initBoard()方法初始化一些重要的变量。board变量是一个从0到7的数字列表。它代表了面板上各种形状和位置。
    def initBoard(self):
        
        self.timer = QBasicTimer()
        self.isWaitingAfterLine = False
 
        self.curX = 0
        self.curY = 0
        self.numLinesRemoved = 0
        self.board = []
 
        self.setFocusPolicy(Qt.StrongFocus)
        self.isStarted = False
        self.isPaused = False
        self.clearBoard()
 
    #shapeAt()方法确定在给定形状块的类型。
    def shapeAt(self, x, y):
        return self.board[(y * Board.BoardWidth) + x]
    
    def setShapeAt(self, x, y, shape):
        self.board[(y * Board.BoardWidth) + x] = shape
    #Board可以动态地调整大小。因此,块的大小可能会有所改变。squareWidth()计算单一方块像素的宽度并返回它。Board.BoardWidth方块板的大小。
    def squareWidth(self):
        return self.contentsRect().width() // Board.BoardWidth
 
    def squareHeight(self):
        return self.contentsRect().height() // Board.BoardHeight
    #游戏开始方法
    def start(self):
 
        if self.isPaused:
            return
 
        self.isStarted = True
        self.isWaitingAfterLine = False
        self.numLinesRemoved = 0
        self.clearBoard()
 
        self.msg2Statusbar.emit(str(self.numLinesRemoved))
 
        self.newPiece()
        self.timer.start(Board.Speed, self)
    #游戏暂停方法
    def pause(self):
 
        if not self.isStarted:
            return
 
        self.isPaused = not self.isPaused
 
        if self.isPaused:
            self.timer.stop()
            self.msg2Statusbar.emit("paused")
 
        else:
            self.timer.start(Board.Speed, self)
            self.msg2Statusbar.emit(str(self.numLinesRemoved))
 
        self.update()
    #窗体绘图
    def paintEvent(self, event):
 
        painter = QPainter(self)
        #根据窗体舞台大小计算顶部
        rect = self.contentsRect()
 
        boardTop = rect.bottom() - Board.BoardHeight * self.squareHeight()
        #游戏的绘制分为两个步骤，第一步，绘制所有方块，这些方块都要保存在底部列表中。列表通过shapeAt() 方法来添加方块。
        for i in range(Board.BoardHeight):
            for j in range(Board.BoardWidth):
                shape = self.shapeAt(j, Board.BoardHeight - i - 1)
 
                if shape != Tetrominoe.NoShape:
                    self.drawSquare(painter,
                                    rect.left() + j * self.squareWidth(),
                                    boardTop + i * self.squareHeight(), shape)
        #第二步绘制下降中的方块
        if self.curPiece.shape() != Tetrominoe.NoShape:
 
            for i in range(4):
                x = self.curX + self.curPiece.x(i)
                y = self.curY - self.curPiece.y(i)
                self.drawSquare(painter, rect.left() + x * self.squareWidth(),
                                boardTop + (Board.BoardHeight - y - 1) * self.squareHeight(),
                                self.curPiece.shape())
 
    def keyPressEvent(self, event):
 
        if not self.isStarted or self.curPiece.shape() == Tetrominoe.NoShape:
            super(Board, self).keyPressEvent(event)
            return
 
        key = event.key()
 
        if key == Qt.Key_P:
            self.pause()
            return
 
        if self.isPaused:
            return
        #keyPressEvent()方法检查按下键。当按右箭头键,我们试图向右移动一块。我们使用tyrMove,因为可能无法移动。
        elif key == Qt.Key_Left:
            self.tryMove(self.curPiece, self.curX - 1, self.curY)
 
        elif key == Qt.Key_Right:
            self.tryMove(self.curPiece, self.curX + 1, self.curY)
        #向上箭头键将旋转方块。
        elif key == Qt.Key_Down:
            self.tryMove(self.curPiece.rotateRight(), self.curX, self.curY)
 
        elif key == Qt.Key_Up:
            self.tryMove(self.curPiece.rotateLeft(), self.curX, self.curY)
        #空格键立即下降到底部
        elif key == Qt.Key_Space:
            self.dropDown()
        #按下D键，可以加速下降。
        elif key == Qt.Key_D:
            self.oneLineDown()
 
        else:
            super(Board, self).keyPressEvent(event)
    #计时器事件,当我们前一个方块降到底部后，创建一个新的方块。
    def timerEvent(self, event):
 
        if event.timerId() == self.timer.timerId():
 
            if self.isWaitingAfterLine:
                self.isWaitingAfterLine = False
                self.newPiece()
            else:
                self.oneLineDown()
 
        else:
            super(Board, self).timerEvent(event)
    #clearBoard()方法通过设置Tetrominoe.NoShape清除面板
    def clearBoard(self):
 
        for i in range(Board.BoardHeight * Board.BoardWidth):
            self.board.append(Tetrominoe.NoShape)
 
    def dropDown(self):
 
        newY = self.curY
 
        while newY > 0:
 
            if not self.tryMove(self.curPiece, self.curX, newY - 1):
                break
 
            newY -= 1
 
        self.pieceDropped()
 
    def oneLineDown(self):
 
        if not self.tryMove(self.curPiece, self.curX, self.curY - 1):
            self.pieceDropped()
 
    def pieceDropped(self):
 
        for i in range(4):
            x = self.curX + self.curPiece.x(i)
            y = self.curY - self.curPiece.y(i)
            self.setShapeAt(x, y, self.curPiece.shape())
 
        self.removeFullLines()
 
        if not self.isWaitingAfterLine:
            self.newPiece()
    #如果到达底部,会调用removeFullLines()方法。我们会检查所有完整的线条然后删除它们。然后移动所有行高于当前删除整行一行。请注意,我们反的顺序行被删除。否则,就会出错。
    def removeFullLines(self):
 
        numFullLines = 0
        rowsToRemove = []
 
        for i in range(Board.BoardHeight):
 
            n = 0
            for j in range(Board.BoardWidth):
                if not self.shapeAt(j, i) == Tetrominoe.NoShape:
                    n = n + 1
 
            if n == 10:
                rowsToRemove.append(i)
 
        rowsToRemove.reverse()
 
        for m in rowsToRemove:
 
            for k in range(m, Board.BoardHeight):
                for l in range(Board.BoardWidth):
                    self.setShapeAt(l, k, self.shapeAt(l, k + 1))
 
        numFullLines = numFullLines + len(rowsToRemove)
 
        if numFullLines > 0:
            self.numLinesRemoved = self.numLinesRemoved + numFullLines
            self.msg2Statusbar.emit(str(self.numLinesRemoved))
 
            self.isWaitingAfterLine = True
            self.curPiece.setShape(Tetrominoe.NoShape)
            self.update()
    #通过newPiece()方法创建一个新的方块，如果不能进入它的初始位置,游戏就结束了。
    def newPiece(self):
 
        self.curPiece = Shape()
        self.curPiece.setRandomShape()
        self.curX = Board.BoardWidth // 2 + 1
        self.curY = Board.BoardHeight - 1 + self.curPiece.minY()
 
        if not self.tryMove(self.curPiece, self.curX, self.curY):
            self.curPiece.setShape(Tetrominoe.NoShape)
            self.timer.stop()
            self.isStarted = False
            self.msg2Statusbar.emit("Game over")
    #使用tryMove()方法尝试移动方块。如果方块的边缘已经接触到面板边缘或者不能移动,我们返回False。否则我们当前块下降到一个新的位置。
    def tryMove(self, newPiece, newX, newY):
 
        for i in range(4):
 
            x = newX + newPiece.x(i)
            y = newY - newPiece.y(i)
 
            if x < 0 or x >= Board.BoardWidth or y < 0 or y >= Board.BoardHeight:
                return False
 
            if self.shapeAt(x, y) != Tetrominoe.NoShape:
                return False
 
        self.curPiece = newPiece
        self.curX = newX
        self.curY = newY
        self.update()
 
        return True
 
    def drawSquare(self, painter, x, y, shape):
 
        colorTable = [0x000000, 0xCC6666, 0x66CC66, 0x6666CC,
                      0xCCCC66, 0xCC66CC, 0x66CCCC, 0xDAAA00]
 
        color = QColor(colorTable[shape])
        painter.fillRect(x + 1, y + 1, self.squareWidth() - 2,
                         self.squareHeight() - 2, color)
 
        painter.setPen(color.lighter())
        painter.drawLine(x, y + self.squareHeight() - 1, x, y)
        painter.drawLine(x, y, x + self.squareWidth() - 1, y)
 
        painter.setPen(color.darker())
        painter.drawLine(x + 1, y + self.squareHeight() - 1,
                         x + self.squareWidth() - 1, y + self.squareHeight() - 1)
        painter.drawLine(x + self.squareWidth() - 1,
                         y + self.squareHeight() - 1, x + self.squareWidth() - 1, y + 1)
 
#Tetrominoe类包含所有可能的形状。NoShape空形状。
class Tetrominoe(object):
    NoShape = 0
    ZShape = 1
    SShape = 2
    LineShape = 3
    TShape = 4
    SquareShape = 5
    LShape = 6
    MirroredLShape = 7
 
#Shape 类保存方块信息  
class Shape(object):
    #coordsTable 元组包含所有可能的俄罗斯方块的坐标值。这是一个模板的所有块坐标值。
    coordsTable = (
        ((0, 0), (0, 0), (0, 0), (0, 0)),
        ((0, -1), (0, 0), (-1, 0), (-1, 1)),
        ((0, -1), (0, 0), (1, 0), (1, 1)),
        ((0, -1), (0, 0), (0, 1), (0, 2)),
        ((-1, 0), (0, 0), (1, 0), (0, 1)),
        ((0, 0), (1, 0), (0, 1), (1, 1)),
        ((-1, -1), (0, -1), (0, 0), (0, 1)),
        ((1, -1), (0, -1), (0, 0), (0, 1))
    )
 
    def __init__(self):
 
        self.coords = [[0, 0] for i in range(4)]
        self.pieceShape = Tetrominoe.NoShape
 
        self.setShape(Tetrominoe.NoShape)
 
    def shape(self):
        return self.pieceShape
 
    def setShape(self, shape):
 
        table = Shape.coordsTable[shape]
 
        for i in range(4):
            for j in range(2):
                self.coords[i][j] = table[i][j]
 
        self.pieceShape = shape
 
    def setRandomShape(self):
        self.setShape(random.randint(1, 7))
 
    def x(self, index):
        return self.coords[index][0]
 
    def y(self, index):
        return self.coords[index][1]
 
    def setX(self, index, x):
        self.coords[index][0] = x
 
    def setY(self, index, y):
        self.coords[index][1] = y
 
    def minX(self):
 
        m = self.coords[0][0]
        for i in range(4):
            m = min(m, self.coords[i][0])
 
        return m
 
    def maxX(self):
 
        m = self.coords[0][0]
        for i in range(4):
            m = max(m, self.coords[i][0])
 
        return m
 
    def minY(self):
 
        m = self.coords[0][1]
        for i in range(4):
            m = min(m, self.coords[i][1])
 
        return m
 
    def maxY(self):
 
        m = self.coords[0][1]
        for i in range(4):
            m = max(m, self.coords[i][1])
 
        return m
    #rotateLeft() 向左旋转方块。如果方块本身不能被旋转，我们就返回当前对象的应用。否则就创建一个新的块及其坐标设置为的旋转。
    def rotateLeft(self):
 
        if self.pieceShape == Tetrominoe.SquareShape:
            return self
 
        result = Shape()
        result.pieceShape = self.pieceShape
 
        for i in range(4):
            result.setX(i, self.y(i))
            result.setY(i, -self.x(i))
 
        return result
 
    def rotateRight(self):
 
        if self.pieceShape == Tetrominoe.SquareShape:
            return self
 
        result = Shape()
        result.pieceShape = self.pieceShape
 
        for i in range(4):
            result.setX(i, -self.y(i))
            result.setY(i, self.x(i))
 
        return result
 
 
if __name__ == '__main__':
    app = QApplication([])
    tetris = Tetris()
    sys.exit(app.exec_())

计算器

#!/usr/bin/env python
# -*- coding:UTF-8 -*-
# calculator

import sys

from PyQt5.QtGui import *
from PyQt5.QtCore import *


class UI_form(QWidget):
    def __init__(self,parent = None):
             QWidget.__init__(self)

             self.setWindowTitle('UI')

             grid = QGridLayout() #网格式布局
             global lcd
             lcd = QTextBrowser()
             lcd.setFixedHeight(90)
             lcd.setFont(QFont("Microsoft YaHei", 20))
             lcd.setText('0'.decode('utf-8'))
             grid.setSpacing(0)
             grid.addWidget(lcd, 0, 0, 1, 5)

    # ---------------------按钮定义及显示-------------------------

             button_0 = QPushButton('0')
             grid.addWidget(button_0,5,0)

             button_1 = QPushButton('1')
             grid.addWidget(button_1,4,0)

             button_2 = QPushButton('2')
             grid.addWidget(button_2,4,1)

             button_3 = QPushButton('3')
             grid.addWidget(button_3,4,2)

             button_4 = QPushButton('4')
             grid.addWidget(button_4,3,0)

             button_5 = QPushButton('5')
             grid.addWidget(button_5,3,1)

             button_6 = QPushButton('6')
             grid.addWidget(button_6,3,2)

             button_7 = QPushButton('7')
             grid.addWidget(button_7,2,0)

             button_8 = QPushButton('8')
             grid.addWidget(button_8,2,1)

             button_9 = QPushButton('9')
             grid.addWidget(button_9,2,2)

             button_plus = QPushButton('+')
             grid.addWidget(button_plus,2,3)

             button_dec = QPushButton('-')
             grid.addWidget(button_dec,3,3)

             button_mul = QPushButton('*')
             grid.addWidget(button_mul,4,3)

             button_dev = QPushButton('/')
             grid.addWidget(button_dev,5,3)

             button_eq = QPushButton('=')
             grid.addWidget(button_eq,5,2)

             button_point = QPushButton('.')
             grid.addWidget(button_point,5,1)

             button_close = QPushButton('Close')
             grid.addWidget(button_close,1,0)

             button_clear = QPushButton('Clear')
             grid.addWidget(button_clear,1,1)

             button_blk = QPushButton('Blk')
             grid.addWidget(button_blk,1,2)

#--------------------------------------------------

             self.setLayout(grid)
             self.resize(350, 300)

             self.str1 = ''#接收第一个要运算的数
             self.str2 = ''#接收第二个要运算的数
             self.flag = '0'
             self.calFlag = ''
             lcd.setText(self.str1)

             #数字键事件处理
             QObject.connect(button_7,SIGNAL("clicked()"),self.func_button7)
             QObject.connect(button_8,SIGNAL("clicked()"),self.func_button8)
             QObject.connect(button_9,SIGNAL("clicked()"),self.func_button9)
             QObject.connect(button_4,SIGNAL("clicked()"),self.func_button4)
             QObject.connect(button_5,SIGNAL("clicked()"),self.func_button5)
             QObject.connect(button_6,SIGNAL("clicked()"),self.func_button6)
             QObject.connect(button_1,SIGNAL("clicked()"),self.func_button1)
             QObject.connect(button_2,SIGNAL("clicked()"),self.func_button2)
             QObject.connect(button_3,SIGNAL("clicked()"),self.func_button3)
             QObject.connect(button_0,SIGNAL("clicked()"),self.func_button0)
             #运算符按键事件处理
             QObject.connect(button_plus,SIGNAL("clicked()"),self.func_buttonAdd)
             QObject.connect(button_dec,SIGNAL("clicked()"),self.func_buttonDec)
             QObject.connect(button_mul,SIGNAL("clicked()"),self.func_buttonMul)
             QObject.connect(button_dev,SIGNAL("clicked()"),self.func_buttonChu)
             QObject.connect(button_eq,SIGNAL("clicked()"),self.func_buttonEqual)
             QObject.connect(button_clear,SIGNAL("clicked()"),self.func_buttonClear)
    def closeEvent(self,event):#窗口关闭时的处理，只实现这个函数就可以，不用去调用
        reply = QMessageBox.question(self,'Message',"Are you sure to quit?",QMessageBox.Yes,QMessageBox.No)
        if reply == QMessageBox.Yes:
            event.accept()
        else:
            event.ignore()
    def func_button7(self):

        if self.flag == '1':
            self.str2 = self.str2 + '7'
            lcd.setText(self.str2)
        else:
            self.str1 = self.str1 + '7'
            lcd.setText(self.str1)
    def func_button8(self):
        if self.flag == '1':
            self.str2 = self.str2 + '8'
            lcd.setText(self.str2)
        else:
            self.str1 = self.str1 + '8'
            lcd.setText(self.str1)
    def func_button9(self):
        if self.flag == '1':
            self.str2 = self.str2 + '9'
            lcd.setText(self.str2)
        else:
            self.str1 = self.str1 + '9'
            lcd.setText(self.str1)
    def func_button4(self):
        if self.flag == '1':
            self.str2 = self.str2 + '4'
            lcd.setText(self.str2)
        else:
            self.str1 = self.str1 + '4'
            lcd.setText(self.str1)
    def func_button5(self):
        if self.flag == '1':
            self.str2 = self.str2 + '5'
            lcd.setText(self.str2)
        else:
            self.str1 = self.str1 + '5'
            lcd.setText(self.str1)
    def func_button6(self):
        if self.flag == '1':
            self.str2 = self.str2 + '6'
            lcd.setText(self.str2)
        else:
            self.str1 = self.str1 + '6'
            lcd.setText(self.str1)
    def func_button1(self):
        if self.flag == '1':
            self.str2 = self.str2 + '1'
            lcd.setText(self.str2)
        else:
            self.str1 = self.str1 + '1'
            lcd.setText(self.str1)
    def func_button2(self):
        if self.flag == '1':
            self.str2 = self.str2 + '2'
            lcd.setText(self.str2)
        else:
            self.str1 = self.str1 + '2'
            lcd.setText(self.str1)
    def func_button3(self):
        if self.flag == '1':
            self.str2 = self.str2 + '3'
            lcd.setText(self.str2)
        else:
            self.str1 = self.str1 + '3'
            lcd.setText(self.str1)
    def func_button0(self):
        if self.flag == '1':
            self.str2 = self.str2 + '0'
            lcd.setText(self.str2)
        else:
            self.str1 = self.str1 + '0'
            lcd.setText(self.str1)
    #运算符处理函数
    def func_buttonAdd(self):
        lcd.setText(self.str2)
        self.flag = '1'
        self.calFlag = '1'
    def func_buttonDec(self):
        lcd.setText(self.str2)
        self.flag = '1'
        self.calFlag = '2'
    def func_buttonMul(self):
        lcd.setText(self.str2)
        self.flag = '1'
        self.calFlag = '3'
    def func_buttonChu(self):
        lcd.setText(self.str2)
        self.flag = '1'
        self.calFlag = '4'
    def func_buttonEqual(self):
        #字符串先转换为数字，计算结果后再转换为字符串
        if self.calFlag == '1':
            num = str(int(self.str1) + int(self.str2))
        elif self.calFlag == '2':
            num = str(int(self.str1) - int(self.str2))
        elif self.calFlag == '3':
            num = str(int(self.str1) * int(self.str2))
        elif self.calFlag == '4':
             num = str(int(self.str1) / int(self.str2))
        else:
            self.calFlag = '0'
        lcd.setText(num)
    def func_buttonClear(self):
        self.str1 = ''
        self.str2 = ''
        lcd.setText('')
        self.flag = '0'

if __name__ == "__main__":
    app = QApplication(sys.argv)
    myapp = UI_form()
    myapp.show()
    sys.exit(app.exec_())

计算器