PyQt5 Simple Calculator

The rest of the calculation function (Self.calculator) is not implemented, and interested friends can implement it

"Knowledge points"

1. Use the Loop to add button parts, and to set the signal/slot for each button

2, give the button set fixed size:button.setfixedsize (qtcore.qsize (60,30))

3. Take the text of the sender of the event (this example is the individual button): Self.sender (). Text ()

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"Source Code"

1 ImportSYS2  fromPyQt5ImportQtwidgets,qtcore,qtgui3 4 5 classExample (qtwidgets.qwidget):6 7     def __init__(self):8Super (Example, self).__init__()9 Self.initui ()Ten          One Self.reset () A  -     defInitui (self): -Self.setwindowtitle ('Simple Calculator') theGrid =qtwidgets.qgridlayout () -          -Self.display = Qtwidgets.qlineedit ('0') -Self.display.setFont (Qtgui.qfont (" Times", 20)) + self.display.setReadOnly (True) - self.display.setAlignment (QtCore.Qt.AlignRight) +Self.display.setMaxLength (15) AGrid.addwidget (self.display,0,0,1,4) at  -names = ['Clear',' Back',"','Close',  -                 '7','8','9','/', -                 '4','5','6','*',  -                 '1','2','3','-', -                 '0','.','=','+'] inpos = [(0, 0), (0, 1), (0, 2), (0, 3), -(1, 0), (1, 1), (1, 2), (1, 3), to(2, 0), (2, 1), (2, 2), (2, 3), +(3, 0), (3, 1), (3, 2), (3, 3 ), -(4, 0), (4, 1), (4, 2), (4, 3)] thec =0 *          forNameinchnames: $button =Qtwidgets.qpushbutton (name)Panax NotoginsengButton.setfixedsize (Qtcore.qsize (60,30)) -Button.clicked.connect (self.buttonclicked)#set the signal/slot for each button the             ifc = = 2: +                 Pass A                 #Grid.addwidget (Qtwidgets.qlabel ("), 0, 2) #替换 The third button is a text label!  the             Else:  +Grid.addwidget (Button, pos[c][0]+1, pos[c][1]) -c = C + 1 $          $ self.setlayout (GRID) -          -          the          -         Wuyi     defbuttonclicked (self): the         #sender = Self.sender (); # Identify the sender of the signal -         #Self.display.setText (Sender.text ()) WuText =Self.sender (). Text () -         ifTextinch '+-*/': AboutSelf.history.append (Self.number)#digital into the stack $Self.history.append (text)#operator into the stack -Self.operator = text#Set Current operator -Self.number ="" #Digital emptying -Self.numbertype ="int" A             return +         elifText = ="=": theSelf.calculate ()#Calculation -         elifText = =" Back": $             Pass the         elifText = ="Clear": the Self.reset () the         elifText = ="Close": the self.close () -         elifText = =".": in             ifSelf.numbertype = ="int": theSelf.number + =text theSelf.numbertype ="float" About         Else: theSelf.number = self.number + textifSelf.number! ="0" Elsetext the  the Self.display.setText (Self.number) +          -     defCalculate (self): the         PassBayi          the     defReset (self): theSelf.number ="0" -Self.result =0 -Self.history = [] theSelf.operator ="' # +,-,*,/ theSelf.numbertype ='int' #int and float two, if the decimal point is a real number the  theApp =qtwidgets.qapplication (SYS.ARGV) -ex =Example () the ex.show () theSys.exit (App.exec_ ())

PyQt5 Simple Calculator