shopping_list.py

def display_menu():
    print("\nGrocery Shopping List Manager")
    print("1. Add an Item")
    print("2. Remove an Item")
    print("3. View the List")
    print("4. Calculate Item Statistics")
    print("5. Sort the List")
    print("6. Search for an Item")
    print("7. Exit the Program")
 
 
def add_item(grocery_list):
    item = input("Enter the item name: ").strip()
    if not item:
        print("Invalid input. Item name cannot be empty.")
        return
   
    try:
        quantity = int(input("Enter the quantity: "))
        if quantity <= 0:
            print("Quantity must be greater than zero.")
            return
        grocery_list[item] = grocery_list.get(item, 0) + quantity
        print(f"{quantity} {item}(s) added to the list.")
    except ValueError:
        print("Invalid input. Please enter a valid number for quantity.")
 
 
def remove_item(grocery_list):
    item = input("Enter the item name to remove: ").strip()
    if item not in grocery_list:
        print("Item not found in the list.")
        return
   
    try:
        quantity = int(input("Enter the quantity to remove: "))
        if quantity <= 0:
            print("Quantity must be greater than zero.")
            return
       
        if quantity >= grocery_list[item]:
            del grocery_list[item]
            print(f"{item} removed from the list.")
        else:
            grocery_list[item] -= quantity
            print(f"{quantity} {item}(s) removed from the list.")
    except ValueError:
        print("Invalid input. Please enter a valid number for quantity.")
 
 
def view_list(grocery_list):
    if not grocery_list:
        print("Your grocery list is empty.")
    else:
        print("\nGrocery List:")
        for item, quantity in grocery_list.items():
            print(f"{item}: {quantity}")
 
 
def calculate_statistics(grocery_list):
    total_quantity = sum(grocery_list.values())
    total_unique_items = len(grocery_list)
    print(f"Total quantity of all items: {total_quantity}")
    print(f"Total number of unique items: {total_unique_items}")
 
 
def sort_list(grocery_list):
    if not grocery_list:
        print("The list is empty, nothing to sort.")
        return
   
    print("Choose sorting option:")
    print("1. Alphabetically (A-Z)")
    print("2. Alphabetically (Z-A)")
    print("3. By Quantity (Low to High)")
    print("4. By Quantity (High to Low)")
   
    choice = input("Enter your choice: ")
    if choice == "1":
        sorted_items = sorted(grocery_list.items())
    elif choice == "2":
        sorted_items = sorted(grocery_list.items(), reverse=True)
    elif choice == "3":
        sorted_items = sorted(grocery_list.items(), key=lambda x: x[1])
    elif choice == "4":
        sorted_items = sorted(grocery_list.items(), key=lambda x: x[1], reverse=True)
    else:
        print("Invalid choice.")
        return
   
    print("\nSorted Grocery List:")
    for item, quantity in sorted_items:
        print(f"{item}: {quantity}")
 
 
def search_item(grocery_list):
    item = input("Enter the item name to search: ").strip()
    if item in grocery_list:
        print(f"{item} is in the list with quantity: {grocery_list[item]}")
    else:
        print("Item not found in the list.")
 
 
def main():
    grocery_list = {}
    while True:
        display_menu()
        choice = input("Enter your choice: ")
       
        if choice == "1":
            add_item(grocery_list)
        elif choice == "2":
            remove_item(grocery_list)
        elif choice == "3":
            view_list(grocery_list)
        elif choice == "4":
            calculate_statistics(grocery_list)
        elif choice == "5":
            sort_list(grocery_list)
        elif choice == "6":
            search_item(grocery_list)
        elif choice == "7":
            print("Exiting the program. Goodbye!")
            break
        else:
            print("Invalid choice. Please enter a number between 1 and 7.")
 
 
if __name__ == "__main__":
    main()