Julien Cigar ha scritto:
> Hi list,
>
> With the following :
>
> >>> a = Invasive.get(67).habitats
> >>> b = Invasive.get(57).habitats
> >>> type(a), type(b)
> (<class 'sqlalchemy.orm.attributes.InstrumentedList'>, <class
> 'sqlalchemy.orm.attributes.InstrumentedList'>)
> >>> a == b
> True
> >>> a
> [<tgias.models.habitat.Habitat object at 0x8d635ec>,
> <tgias.models.habitat.Habitat object at 0x8d5d8ec>]
> >>> b
> [<tgias.models.habitat.Habitat object at 0x8d635ec>,
> <tgias.models.habitat.Habitat object at 0x8d5d8ec>]
> >>> a.reverse()
> >>> a
> [<tgias.models.habitat.Habitat object at 0x8d5d8ec>,
> <tgias.models.habitat.Habitat object at 0x8d635ec>]
> >>> b
> [<tgias.models.habitat.Habitat object at 0x8d635ec>,
> <tgias.models.habitat.Habitat object at 0x8d5d8ec>]
> >>> a == b
> False
>
> Would it not be logical to have True instead of False for the last
> statement ?
I don't think so, because the default order is an information !
a == b is a comparo of content so [1,2,3] is different than [3,2,1]
sometimes ordering in presentation of data is a useful information.
> Do you think the order of an InstrumentedList is important
> for collections (in a boolean context) ?
>
Yes it is.
You can use set for compare w/out order or a is b for compare identical
items too.
Glauco
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