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calculator.py
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calculator.py
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from PyQt5.QtWidgets import QApplication, QWidget
from PyQt5 import uic
import sys
class MyForm(QWidget):
def __init__(self, parent=None):
QWidget.__init__(self, parent)
Form, Base = uic.loadUiType('calc.ui')
self.form = Form()
self.form.setupUi(self)
self.form.b1.clicked.connect(self.handler)
self.form.b2.clicked.connect(self.handler)
self.form.b3.clicked.connect(self.handler)
self.form.b4.clicked.connect(self.handler)
self.form.b5.clicked.connect(self.handler)
self.form.b6.clicked.connect(self.handler)
self.form.b7.clicked.connect(self.handler)
self.form.b8.clicked.connect(self.handler)
self.form.b9.clicked.connect(self.handler)
self.form.b0.clicked.connect(self.handler)
self.form.b_dot.clicked.connect(self.handler)
self.form.b_div.clicked.connect(self.handler)
self.form.b_minus.clicked.connect(self.handler)
self.form.b_mult.clicked.connect(self.handler)
self.form.b_plus.clicked.connect(self.handler)
self.form.b_eq.clicked.connect(self.handler)
self.form.b_clear.clicked.connect(self.handler)
self.form.lcdNumber.setNumDigits(10)
self.number_one = None
self.number_two = None
self.operation = None
def handler(self):
# clicking on button results in assignment its text to text_button variable
button = self.sender()
text_button = button.text() # text_button type is <str>
if self.number_one is None and self.number_two is None and self.operation is None:
if text_button in ['1', '2', '3', '4', '5', '6', '7', '8', '9', '0']:
self.number_one = ''
self.number_one += text_button
self.form.lcdNumber.display(self.number_one)
if text_button in ['+', '-', '*', '/']:
self.number_one = '0'
self.operation = text_button
if text_button == '.':
self.number_one = '0.'
self.form.lcdNumber.display(self.number_one)
if text_button == 'C':
pass
if text_button == '=':
self.form.lcdNumber.display('0')
elif self.number_one is not None and self.number_two is None and self.operation is None:
if text_button in ['1', '2', '3', '4', '5', '6', '7', '8', '9', '0']:
if self.number_one == '0' and text_button == '0':
pass
elif len(self.number_one) > 6:
pass
else:
self.number_one += text_button
self.form.lcdNumber.display(self.number_one)
if text_button in ['+', '-', '*', '/']:
self.operation = text_button
self.form.lcdNumber.display(self.number_one)
if text_button == '.':
if '.' in self.number_one:
pass
else:
self.number_one += text_button
self.form.lcdNumber.display(self.number_one)
if text_button == 'C':
self.number_one = None
self.form.lcdNumber.display(int(0))
if text_button == '=':
self.form.lcdNumber.display(self.number_one)
elif self.number_one is not None and self.number_two is None and self.operation is not None:
if text_button in ['1', '2', '3', '4', '5', '6', '7', '8', '9', '0']:
self.number_two = ''
self.number_two += text_button
self.form.lcdNumber.display(self.number_two)
if text_button in ['+', '-', '*', '/']:
self.operation = text_button
self.form.lcdNumber.display(self.number_one)
if text_button == '.':
self.number_two = '0.'
self.form.lcdNumber.display(self.number_two)
if text_button == 'C':
self.number_one = None
self.operation = None
self.form.lcdNumber.display('0')
if text_button == '=':
self.operation = None
self.form.lcdNumber.display(self.number_one)
elif self.number_one is not None and self.number_two is not None and self.operation is not None:
if text_button in ['1', '2', '3', '4', '5', '6', '7', '8', '9', '0']:
if self.number_two == '0' and text_button == '0':
pass
if len(self.number_two) > 6:
pass
else:
self.number_two += text_button
self.form.lcdNumber.display(self.number_two)
if text_button in ['+', '-', '*', '/']:
n1 = float(self.number_one)
n2 = float(self.number_two)
if self.operation == '/' and n2 == 0:
self.number_one = None
self.number_two = None
self.operation = None
self.form.lcdNumber.display('Error')
else:
if self.operation == '+':
res = n1 + n2
if self.operation == '-':
res = n1 - n2
if self.operation == '*':
res = n1 * n2
if self.operation == '/':
res = n1 / n2
res = round(res, 6)
if int(res) == res:
res = int(res)
self.form.lcdNumber.display(res)
else:
self.form.lcdNumber.display(res)
self.number_one = str(res)
self.operation = text_button
self.number_two = None
if text_button == '.':
if '.' in self.number_two:
pass
else:
self.number_two += text_button
self.form.lcdNumber.display(self.number_two)
if text_button == '=':
n1 = float(self.number_one)
n2 = float(self.number_two)
if self.operation == '/' and n2 == 0:
self.number_one = None
self.number_two = None
self.operation = None
self.form.lcdNumber.display('Error')
else:
if self.operation == '+':
res = n1 + n2
if self.operation == '-':
res = n1 - n2
if self.operation == '*':
res = n1 * n2
if self.operation == '/':
res = n1 / n2
res = round(res, 6)
if int(res) == res:
res = int(res)
self.form.lcdNumber.display(res)
else:
self.form.lcdNumber.display(res)
self.number_one = str(res)
self.number_two = None
self.operation = None
'''
if text_button in ('1', '2', '3', '4', '5', '6', '7', '8', '9', '0', '.'):
if self.operation == '':
self.text_number_one += text_button
self.form.lcdNumber.display(self.text_number_one)
else:
self.text_number_two += text_button
self.form.lcdNumber.display(self.text_number_two)
elif text_button in ('+', '-', '*', '/'):
self.operation = text_button
self.form.lcdNumber.display(self.text_number_one)
elif text_button == '=':
if self.text_number_one == '':
self.number_one = 0
else:
self.number_one = int(self.text_number_one)
if self.text_number_two == '':
self.number_two = 0
else:
self.number_two = int(self.text_number_two)
res = 0
if self.operation == '+':
res = self.number_one + self.number_two
if self.operation == '-':
res = self.number_one - self.number_two
if self.operation == '*':
res = self.number_one * self.number_two
if self.operation == '/':
if self.number_two == 0:
res = 'Error'
else:
res = self.number_one / self.number_two
res = round(res, 7)
if self.operation == '':
res = self.number_two
self.form.lcdNumber.display(res)
self.text_number_one = ''
self.number_one = 0
self.text_number_two = str(res)
self.number_two = res
self.operation = ''
elif text_button == 'C':
self.form.lcdNumber.display('0')
self.number_one = 0
self.number_two = 0
self.text_number_one = ''
self.text_number_two = ''
self.operation = ''
'''
def main():
if __name__ == '__main__':
app = QApplication(sys.argv)
window = MyForm()
window.show()
sys.exit(app.exec_())
main()