Thanks for your response, I want to print/repr an OrderedDict() without relying
on the fact that "dict are ordered" ie. I want a solution < python 3.7.
Currently, if I do repr( OrderedDict([(1,2),(3,4)]) ), I get the string
"OrderedDict([(1,2),(3,4)])", I'd like a function that would return the string
"{1: 2, 3: 4}" in the correct order.
If I do repr(dict( OrderedDict([(1,2),(3,4)]) )) I get "{1: 2, 3: 4}" because
dict are ordered since python 3.7.
And for pprint, currently pformat( OrderedDict([(1,2),(3,4)]) ) gives the
string 'OrderedDict([(1, 2), (3, 4)])' (and adds \n for bigger dict).
I could do pprint(dict( OrderedDict([(1,2),(3,4)]) )) but again that relies on
python 3.7 behavior.
I'm wondering if there exists an easy way to code this "order preserving repr
and pprint/pformat".
Le ven. 27 juil. 2018 à 07:58, Steven D'Aprano
<[email protected]<mailto:[email protected]>> a écrit :
On Fri, Jul 27, 2018 at 05:30:35AM +0000, Robert Vanden Eynde wrote:
> Currently, what's the best way to implement a function
> f(OrderedDict([(1,2),(3,4)])) == '{1: 2, 3: 4}', works for all
> possible types, and also availaible for pprint with nice indent?
I don't understand the question, and I especially don't understand the
"all possible types" part. Do you actually mean *all* possible types,
like int, float, str, MyClassThatDoesSomethingWeird?
But guessing (possibly incorrectly) what you want:
py> from collections import OrderedDict
py> od = OrderedDict([(1,2),(3,4)])
py> od == {1:2, 3: 4}
True
If efficiency is no concern, then the simplest way to get something that
has a dict repr from an OrderedDict is to use a dict:
py> dict(od)
{1: 2, 3: 4}
This also works as OrderedDict is a subclass of dict, and should avoid
the cost of building an entire dict:
py> dict.__repr__(od)
'{1: 2, 3: 4}'
> If I
> could set a parameter in ipython or python repl that would print that,
> that would already be very useful.
See sys.displayhook.
--
Steve
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