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BUG: cut with non-nano #56101

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merged 12 commits into from
Dec 1, 2023
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  • closes #xxxx (Replace xxxx with the GitHub issue number)
  • Tests added and passed if fixing a bug or adding a new feature
  • All code checks passed.
  • Added type annotations to new arguments/methods/functions.
  • Added an entry in the latest doc/source/whatsnew/vX.X.X.rst file if fixing a bug or adding a new feature.

sits on top of #56099

@mroeschke mroeschke added cut cut, qcut Non-Nano datetime64/timedelta64 with non-nanosecond resolution labels Nov 22, 2023
# TODO: constructing DatetimeIndex with dtype="M8[s]" without truncating
# the first entry here raises in array_to_datetime. Should truncate
# instead of raising?
# TODO: should we truncate to 7 seconds or 8?
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If these are inclusive, left bin edge and in nanos the result was 7.2, I think I would expect 7 instead of 8

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looking at this closer, i think it doesn't really matter bc bins[0] is calculated roughly on min(data) - .001 * (max(data) - min(data)). that .001 * [...] adjustment looks intended to make sure that the bottom bin is a strict lower bound. Exactly how strict doesn't seem to matter. In this test case, max(data) - min(data) is a 2-day Timedelta, and when that Timedelta has second unit, multiplying it by .001 truncated to Timedelta(minutes=2, seconds=52), truncating the .8 seconds.

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Ah I forgot about the 0.001 offset applied to the edges (though it seem code-smelly). The current truncation result should be OK then

@mroeschke mroeschke added this to the 2.2 milestone Dec 1, 2023
@mroeschke mroeschke merged commit 65af776 into pandas-dev:main Dec 1, 2023
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Thanks @jbrockmendel

@jbrockmendel jbrockmendel deleted the bug-cut-non-nano branch December 1, 2023 21:03
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