from PyQt5 import QtWidgets, uic, QtGui
import os

url = os.path.dirname(os.path.abspath(__file__))+os.sep+'cal.ui'

class MyWindow(QtWidgets.QWidget):
    def __init__(self, parent=None):
        global d, a
        QtWidgets.QWidget.__init__(self, parent)
        uic.loadUi(url , self)
        a = 0
        d = ''
        def addnumb(text):
            if text == '.':
                if self.label.text().count('.') < 1:
                    self.label.setText(str(self.label.text()+text))
            else:
                if self.label.text() == '0':
                    self.label.setText(str(int(self.label.text()+text)))
                else:
                    self.label.setText(str(self.label.text()+text))
        def delete():
            if len(self.label.text())>1:
                self.label.setText(self.label.text()[:len(self.label.text())-1])
            else:
                self.label.setText('0')
        def clear():
            self.label.setText('0')
            a = 0
        def summ():
            global d, a
            if self.label.text().count('.')==0:
                a = int(self.label.text())
            else:
                a = float(self.label.text())
            d = '+'
            self.label.setText('0')
        def difference():
            global d, a
            if self.label.text().count('.')==0:
                a = int(self.label.text())
            else:
                a = float(self.label.text())
            d = '-'
            self.label.setText('0')
        def product():
            global d, a
            if self.label.text().count('.')==0:
                a = int(self.label.text())
            else:
                a = float(self.label.text())
            d = '*'
            self.label.setText('0')
        def div():
            global d, a
            if self.label.text().count('.')==0:
                a = int(self.label.text())
            else:
                a = float(self.label.text())
            d = '/'
            self.label.setText('0')
        def work(a, b):
            global d
            if b.count('.')==0:
                b = int(b)
            else:
                b = float(b)
            if d != '':
                if d == '+':
                    self.label.setText(str(a+b))
                elif d == '-':
                    self.label.setText(str(a-b))
                elif d == '*':
                    self.label.setText(str(a*b))
                elif d == '/':
                    self.label.setText(str(a/b))
                a = 0
                d = ''
        def pr():
            global a
            b = str((a / 100) * float(self.label.text()))
            work(a, b)
        def pm():
            if float(self.label.text())>0:
                self.label.setText('-'+self.label.text())
            else:
                self.label.setText(self.label.text()[1:])


        self.but_1.clicked.connect(lambda:addnumb('1'))
        self.but_2.clicked.connect(lambda:addnumb('2'))
        self.but_3.clicked.connect(lambda:addnumb('3'))
        self.but_4.clicked.connect(lambda:addnumb('4'))
        self.but_5.clicked.connect(lambda:addnumb('5'))
        self.but_6.clicked.connect(lambda:addnumb('6'))
        self.but_7.clicked.connect(lambda:addnumb('7'))
        self.but_8.clicked.connect(lambda:addnumb('8'))
        self.but_9.clicked.connect(lambda:addnumb('9'))
        self.but_0.clicked.connect(lambda:addnumb('0'))
        self.but_dot.clicked.connect(lambda:addnumb('.'))
        self.but_del.clicked.connect(delete)
        self.but_c.clicked.connect(clear)
        self.but_pm.clicked.connect(pm)
        self.but_plus.clicked.connect(summ)
        self.but_minus.clicked.connect(difference)
        self.but_mnoz.clicked.connect(product)
        self.but_div.clicked.connect(div)
        self.but.clicked.connect(lambda:work(a, self.label.text()))
        self.but_pr.clicked.connect(pr)
if __name__ == "__main__":
    import sys
    app = QtWidgets.QApplication(sys.argv)
    window = MyWindow()
    window.show()
    sys.exit(app.exec_())