Shopping list with suggestions

# The user is asked to make a shopping list then some extra suggestions
# are given to the user. If they like any of these extra items they are
#added to the list. Python coded by Ken Adams 6 August 2019.

# This is the list of frequent items that a person may have forgot to put ontheirlist.
frequent_items = ["milk", "Brown bread", "cheese", "chrisps", "sardines", "beer", "nuts","soup","jam"]

# The frequentitems are copied to a new list todays-Suggestions.
#The new list will change during the program but the origional list will not change.
todays_suggestions = frequent_items

#This is the users empty shopping list
shopping = []
# The size of the users shopping list is defined
how_many = input("how many items of shopping do you have? ")
how_many = int(how_many)

#A for loop is used to read in the seperate items. In order to compare the users
#list with todays_suggestions all items are converted to lower case. The suggestions
#are already in lower case.If an item already appears on todays-suggestions it is
#removed si that todays_suggestions will only have items that the user has not listed already
for item_number in range(how_many):
    index = item_number+1
    item = input("what is item number " + str(index) + "? ")
    item=item.lower()
    shopping.append(item)
    if item in todays_suggestions:
        todays_suggestions.remove(shopping[item_number])

#The user is asked if they want to see some suggestions. A for loop makes the
#suggestions. As the lenght of todays_suggestions may have changed the 'len function
#is used to decide how many items to loop over. Required items are added to shopping.
print("We have a list of items you normally buy!")
test = input("Would you like to check it and see if you forgot anything? Please type Y or N.")
if test =="Y" or test == "y":
    for item_number in range(len(todays_suggestions)):
        print("We suggest " + todays_suggestions[item_number])
        extra = input("Would you like that? enter Y or N ")
        if extra == "Y" or extra == "y":
            shopping.append(todays_suggestions[item_number])
            print("OK we have added that item to your list")


print("There are " + str(len(shopping)) + " items on my shopping list.")

#The final list is printed.
print("Your final shopping list is:")
print(shopping)


print("bye")