help my python thinks -10 > -1

[CRONighttrain]

the for loop is suppose to sort through the list x2 and then put anything that's lower than the value of the number at j on the list x3 at an index one less than j.
I'm stopping it from putting in a number twice by detecting if a number has been put in using the boolean numberDone.

Yoriz write Aug-09-2021, 05:37 AM:
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[CRONighttrain]

nevermind it was the part where it says x3.insert(j - 1, x2[i]) it should be x3.insert(j, x2[i])