python - creating a list filled with alike values of two different lists -


the whole point of me doing learn how code python without using built in functions given, such sort(), max(), , min(). need create function takes 2 lists arguments , creates new list filled alike values of 2 lists being passed function. new_list cannot take duplicates if list1= [1,2,2,3,4] , list2 = [1,2,2,3,4] new_list should = [1,2,3,4]. problem function have use python built in function in check if x not in new_list. how can extend function check if value within new_list without using python's built-in functions?

def alike_values(list1, list2):    new_list = []    in list1:        x in list2:            if == x , x not in new_list:               new_list.append(i)    return new_list

you create second function, checks if value contained in list:

def alike_values(list1, list2):     new_list = []     in list1:         x in list2:             if == x , not in_list(new_list, x):                 new_list.append(i)     return new_list  def in_list(li, val):     in li:         if == val:             return true     return false

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