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A simple calculator built using OOP, classes and functions

Author: Mmabiaa

Python_Begginer_Projects/Intermediate/Calculator/Calculator.py

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+class calculate:
+    def __init__(self, first_number, second_number):
+
+            self.first_numbeer = first_number
+            self.second_number = second_number
+
+
+
+    def add(self):
+        return self.first_numbeer + self.second_number
+
+    def mul(self):
+        return self.first_numbeer * self.second_number
+
+    def sub(self):
+        return self.first_numbeer - self.second_number
+
+    def div(self):
+        if self.second_number != 0:
+            return self.first_numbeer / self.second_number
+        else:
+            return f'Division by zero is invalid...'

Python_Begginer_Projects/Intermediate/Calculator/__pycache__/Calculator.cpython-312.pyc

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+from Calculator import calculate # import a class module I wrote in Calculator.py called calculate
+
+signs = { # A dictionary to store signs according to user choices from menu
+    1:'+',
+    2:'-',
+    3:'x',
+    4:'/'
+}
+
+def display_menu(): # A method to display menu options to users
+    print(
+        '''---Menu---
+        1. Addition
+        2. Subtraction
+        3. Multiplication
+        4. Division
+        5. Quit
+        
+        '''
+    )
+    accept_user_choice() # Calling a function that accepts user menu choices.
+
+def accept_user_choice(): # A Method to accept user choices
+
+    user_choice = input('Enter a choice from (1 - 5): ') # a prompt variable to accept user choice and store them as string
+
+    if user_choice.isdigit(): # a condition to check if the user choice is a digit or not.
+        user_choice = int(user_choice) # converting user choices from str to int after being a digit
+        validate_user_choice(user_choice) # calling the validation method to validate if user choice is true.
+
+    else: # An else statement to prompt errors
+        print('Invalid user choice...')
+        accept_user_choice() # using recursion method to run this method to re-accept the user choice till conditions are met
+
+
+
+
+def validate_user_choice(choice): # a method to validate user choices for the menu options
+    if 0 < choice < 5: # choices from users should be from (1 - 5) but 5 is an exception to quit the program
+        display_results(choice) # display results after conditions are met
+
+
+    elif choice == 5: # quit the program if a uer choice is 5
+        print('Quiting...')
+        quit()
+
+    else: # a prompt condition to alert users to enter a choice from 1-5
+        print('Choice must be from 1 - 5')
+        accept_user_choice() # calling this method to accept new user choices
+
+def assign_user_choice_to_menu_option(x, y,choice): # a method to assign various choices to appropriate calculations
+    
+    cal = calculate(x, y) # creating an object for the class calculate to be used in calling various class methods.
+
+    if choice == 1:
+        return cal.add()
+    elif choice == 2:
+        return cal.sub()
+    elif choice == 3:
+        return cal.mul()
+    else:
+        return cal.div()
+
+
+def accept_values(): # A method to accept user values for calculations
+
+        x = input('Enter value 1: ')
+        y = input('Enter value 2: ')
+
+        if (x and y).isdigit(): # Checking if valuses are digit then it's converted into float
+            x = float(x)
+            y = float(y)
+
+        else: # a case where values are not digits
+            print('Please enter a digit / a number... ')
+            accept_values()
+        return x, y
+
+def display_results(choice):# method to display the answer
+    x, y = accept_values()
+
+    answer = assign_user_choice_to_menu_option(x, y, choice) # calling this method to assign user choice to right menu option
+
+    for key, pair in signs.items(): # using a for loop to print the answer with the appropriate sign
+        if key == choice:
+            print(f'{x} {pair} {y} = {answer}')
+
+
+
+
+
+def main(): # main loop
+    print('--Calculator--')
+    while True:
+        display_menu() # calling this function to start the process
+
+        again = input('Do you want to continue (n / y): ').lower() # a prompt to ask users for continuation
+        if again != 'y':
+            quit()
+            break
+        else:
+            print(' ')
+
+
+if __name__ == '__main__': # running from the mainloop...
+    main()
+
+#mMabiaa