How can I retrieve identical items from a list regardless of letter case?

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You can convert each item in the list to lowercase using the lower() method and then use a set() to remove duplicates while ignoring case. Here's an example code:

my_list = ["apple", "Banana", "ORANGE", "banana", "grape", "GRAPE"]
unique_items = set(map(str.lower, my_list))

print(unique_items)  # {'apple', 'banana', 'grape', 'orange'}

In this code, the map() function is used to apply the lower() method to each item in the list. The resulting lowercase items are passed to the set() to remove duplicates. The output shows the unique items in the list without regard to letter case.