was preparing my butthole after the last one but ended up being the fastest one i've done 
with open("day6input.txt") as f:
input = f.read()
# part 1
for i in range(len(input)):
marker = set(input[i:i+4])
if len(marker) == 4:
answer = i + 4
break
print(answer)
# part 2
for i in range(len(input)):
marker = set(input[i:i+14])
if len(marker) == 14:
answer = i + 14
break
print(answer)
tech/science swag. 
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guaranteed O(n) solution, if only javascript was a real language and had proper hashmaps with size tracking
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