On 2022-07-28, Ben Hirsig <iamgusi@gmail.com> wrote:

Hi, I noticed this when using the requests library in the response.elapsed object (type timedelta). Tested using the standard datetime library alone with the example displayed on https://docs.python.org/3/library/datetime.html#examples-of-usage-timedelta

It appears as though the timedelta object recursively adds its own
attributes (min, max, resolution) as further timedelta objects. I’m not sure how deep they go, but presumably hitting the recursion limit.

from datetime import timedelta
year = timedelta(days=365)
print(year.max)

999999999 days, 23:59:59.999999

print(year.max.min.max.resolution.max.min)

-999999999 days, 0:00:00

Why do you think this is a bug?

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Hi, I noticed this when using the requests library in the response.elapsed object (type timedelta). Tested using the standard datetime library alone
with the example displayed on https://docs.python.org/3/library/datetime.html#examples-of-usage-timedelta



It appears as though the timedelta object recursively adds its own
attributes (min, max, resolution) as further timedelta objects. I’m not
sure how deep they go, but presumably hitting the recursion limit.

from datetime import timedelta

year = timedelta(days=365)

print(year.max)

999999999 days, 23:59:59.999999

print(year.max.min.max.resolution.max.min)

-999999999 days, 0:00:00



I’m using 3.10.3



Cheers

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On 28/07/2022 10:54, Ben Hirsig wrote:

Hi, I noticed this when using the requests library in the response.elapsed object (type timedelta). Tested using the standard datetime library alone with the example displayed on https://docs.python.org/3/library/datetime.html#examples-of-usage-timedelta

It appears as though the timedelta object recursively adds its own
attributes (min, max, resolution) as further timedelta objects. I’m not sure how deep they go, but presumably hitting the recursion limit.

from datetime import timedelta

year = timedelta(days=365)

print(year.max)

999999999 days, 23:59:59.999999

print(year.max.min.max.resolution.max.min)

-999999999 days, 0:00:00

I’m using 3.10.3

It's not recursion, it's a reference cycle. In fact, more than one:

from datetime import timedelta
year = timedelta(days=365)
type(year)

<class 'datetime.timedelta'>

type(year.max)

<class 'datetime.timedelta'>

year.max is year.max.max

True

type(year.min)

<class 'datetime.timedelta'>

year.min is year.min.min

True

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Ben Hirsig wrote at 2022-7-28 19:54 +1000:

Hi, I noticed this when using the requests library in the response.elapsed >object (type timedelta). Tested using the standard datetime library alone >with the example displayed on >https://docs.python.org/3/library/datetime.html#examples-of-usage-timedelta

It appears as though the timedelta object recursively adds its own
attributes (min, max, resolution) as further timedelta objects. I’m not >sure how deep they go, but presumably hitting the recursion limit.

If you look at the source, you will see that `min`, `max`, `resolution`
are class level attributes. Their values are `timedelta` instances.
Therefore, you can access e.g. `timedelta(days=365).min.max.resolution`.
But this is nothing to worry about.

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Please stay on the list (such that others can help, too)

Ben Hirsig wrote at 2022-7-29 06:53 +1000:

Thanks for the replies, I'm just trying to understand why this would be >useful?

E.g. why does max need a min/max/resolution, and why would these attributes >themselves need a min/max/resolution, etc, etc?

`max` is a `timedelta` and as such inherits (e.g.) `resolution`
from the class (as any other `timedelta` instance).

Note that `timedelta` instances do not have a `max` (`min|resolution`)
slot. When `max` is looked up, it is first searched in the instance
(and not found), then in the class where it is found:
all `max` accesses result in the same object.

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