olist= ["a", "a", "b", "c", "d", "e", "f"]
tlist = []
for x in range(0, len(olist)):
intlist = False
for y in range(0, len(tlist)):
if(olist[x] == tlist[y]):
intlist = True
if(intlist == False):
tlist.append(olist[x])
print(tlist)
#['a', 'b', 'c', 'd', 'e', 'f', 1, 2]