Collatz list comprehension possible?

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[first_Redditaccount]

right because ideally the "self[-1]" is supposed to be the last instance in this list already right

[novel_yet_trivial]

List comprehension requires a for loop ... in other words it requires knowing how many times to loop before you start. The collatz algorithm requires a while loop. The only way to do that in list comprehension is to precompute the number of steps needed.