How do I deduplicate lists in Python safely and idiomatically?

# Using a set to remove duplicates while preserving order
def deduplicate_list(original_list):
    seen = set()
    deduplicated_list = []
    for item in original_list:
        if item not in seen:
            seen.add(item)
            deduplicated_list.append(item)
    return deduplicated_list

# Example usage
my_list = [1, 2, 2, 3, 4, 4, 5]
deduplicated = deduplicate_list(my_list)
print(deduplicated)  # Output: [1, 2, 3, 4, 5]