[Python] How to split parenthesis in order to do priority of arithemtic operations in a python...

I am currently trying to create a fully functional calculator using PyQt6. The basic operations are working. My next goal for my app to be able to solve arithmetic operations with numbers in between parenthesis. I am really stuck on how i am supposed to:

1. Split the parenthesis and
2. Make it functional with the rest of the code

Another problem i have is how to handle more than 2 numbers for operations.

Here is the code:

import sys
from PyQt6.QtWidgets import *

app = QApplication(sys.argv)
window = QWidget()
window.setWindowTitle("Calculator")
window.resize(354, 550)
window.move(465, 45)
window.setStyleSheet("background-color: lightsteelblue;")
window.show()

result_display = QLineEdit(window)
result_display.resize(340, 100)
result_display.setStyleSheet("font-size: 24px;")
result_display.setReadOnly(True)
result_display.show()

grid_layout = QGridLayout()
grid_layout.addWidget(result_display, 0, 0, 1, 4)
button_width = 80
button_height = 80

buttons_info = [("C", 1, 0), ("⌫", 1, 1), ("^", 1, 2), ("÷", 1, 3),
("7", 2, 0), ("8", 2, 1), ("9", 2, 2), ("×", 2, 3),
("4", 3, 0), ("5", 3, 1), ("6", 3, 2), ("-", 3, 3),
("1", 4, 0), ("2", 4, 1), ("3", 4, 2), ("+", 4, 3),
("()",5, 0), ("0", 5, 1), (".", 5, 2), ("=", 5, 3)]

first_number = None
operation = None
current_value = 0

def button_clicked(text):
global first_number, operation
current_text = result_display.text()

if text == 'C':
result_display.setText('')
first_number = None
operation = None
elif text == '⌫':
result_display.setText(current_text[:-1])
elif text in ['+', '-', '×', '÷', "^", "()"]:
if current_text != '':
if first_number is None:
first_number = float(current_text)
operation = text
result_display.setText(current_text + text)
elif text == '=':
if current_text != '' and first_number is not None:
second_number = float(current_text.split(operation)[-1])
if operation == '+':
result_value = first_number + second_number
elif operation == '-':
result_value = first_number - second_number
elif operation == '×':
result_value = first_number * second_number
elif operation == '÷':
if second_number == 0:
result_value = "Error"
else:
result_value = round(first_number / second_number, 3)
elif operation == "^":
result_value = first_number ** second_number
result_display.setText(str(result_value))
first_number = None
operation = None
elif operation == "()":
pass
else:
result_display.setText(current_text + text)

for name, row, col in buttons_info:
button = QPushButton(name)
button.setFixedSize(button_width, button_height)
button.setStyleSheet("background-color: cornflowerblue;")
button.clicked.connect(lambda checked, text=name: button_clicked(text))
grid_layout.addWidget(button, row, col)

window.setLayout(grid_layout)
sys.exit(app.exec())


I am a beginner so my code is probably not that good and i know that a lot of things i could have written them better. Also english is not my first language so i don't know whether i have explained my problem well.

Any other tips are welcome

Continue reading...