Storing instances using jsonpickle
rosuav at gmail.com
Fri Sep 5 07:08:09 CEST 2014
On Fri, Sep 5, 2014 at 2:38 PM, Dan Sommers <dan at tombstonezero.net> wrote:
> On Thu, 04 Sep 2014 15:17:17 +1000, Chris Angelico wrote:
>> On Thu, Sep 4, 2014 at 9:39 AM, MRAB <python at mrabarnett.plus.com> wrote:
>>> The key of a dict could also be int, float, or tuple.
>> Yes! Yes! DEFINITELY do this!! Ahem. Calm down a little, it's not that
>> outlandish an idea...
> Using floats is a bad idea. Consider this python code:
> dictionary = dict()
> original = get_some_floating_point_value()
> dictionary[original] = 'foo'
> string_version = str(original) # this is where things head south
> duplicate = float(string_version)
> value = dictionary.get(duplicate)
> Okay, so what is value? Is it 'foo'? Is it None?
> (Yes, I can fix this. If I *know* that original is a float, then I
> could use original.hex() instead of str(original).)
There are issues with direct lookups, yes, but you can safely and
easily iterate over that dictionary, and that's going to have plenty
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