How to perform ceiling-division in integer arithmetic?

Negate before and after?

>>> -(-102 // 10)
11

from math import ceil

print(ceil(10.3))

11

For your use case, use integer arithmetic. There is a simple technique for converting integer floor division into ceiling division:

items = 102
boxsize = 10
num_boxes = (items + boxsize - 1) // boxsize

Alternatively, use negation to convert floor division to ceiling division:

num_boxes = -(items // -boxsize)

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