Combining two lists and removing duplicates, without removing duplicates in original list

Question

I have two lists that i need to combine where the second list has any duplicates of the first list ignored. .. A bit hard to explain, so let me show an example of what the c

Answer 1

You can use sets:

first_list = [1, 2, 2, 5]
second_list = [2, 5, 7, 9]

resultList= list(set(first_list) | set(second_list))

print(resultList)
# Results in : resultList = [1,2,5,7,9]