In this code: main.py

import csv from datetime import datetime def main(): products_file = "products.txt" products = read_products(products_file) print('>>> Inkom Emporium <<<') # print('Products:') # for number, product in products.items(): # This loop is going to print a dictionary # print(number, product) requests_file = "request.txt" process_request(requests_file, products_file) def read_products(file): """ Reads file into a dictionary. """ print() products = {} try: with open(file, "rt") as infile: reader = csv.reader(infile) next(reader) for line in reader: product_number = line[0] product_name = line[1] product_price = line[2] products[product_number] = [product_name, product_price] except KeyError as key_err: print( f"Error: line {reader.line_num} of {file.name} is formatted incorrectly.") # If we write code that attempts to find a key in a dictionary and that key doesn't exist in the dictionary. print(key_err) except FileNotFoundError as file_not_found_err: print(f"Error: cannot open {file} because it doesn't exist.") print(file_not_found_err) exit() except PermissionError as perm_err: print( f"Error: cannot read from {file} because you don't have permission.") print(perm_err) exit() return products def process_request(requests_file, products_file): product_dic = read_products(products_file) current_date = datetime.now() with open(requests_file, "rt") as infile: reader = csv.reader(infile) next(reader) print('Requested items:') number_items = 0 total = 0 sub_total = 0 sales_tax_rate = 0.06 for line in reader: product_number = line[0] product_quantity = line[1] quantity = int(product_quantity) if product_number in product_dic.keys(): product = product_dic[product_number] name = product[0] price = float(product[1]) print(f'{name}: {product_quantity} @ {price}') sub_total = sub_total + quantity * price number_items = number_items + quantity print(f' Number of Items: {number_items}') print(f'Subtotal: {sub_total}') sales_tax = sales_tax_rate * sub_total print(f'Sales Tax: {sales_tax:.2f}') total = sub_total + sales_tax print(f'Total: {total:.2f}') print(' Thank you for shopping at the Inkom Emporium') # Formatting date and time https://stackoverflow.com/a/63061189/7389293 print(f'{current_date:%A %d, %Y, %I:%M %p}') if __name__ == "__main__": main()

I have 1 question.

How can I use the "except KeyError" in the def process_request function? I could use the "except FlileNotFoundError", and the "except PermissionError" but I couldn't with the KeyError.