On 27/07/18 08:06, Robert Vanden Eynde wrote:
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".
It's a fairly non-standard thing to do as you're not representing the
ordered dict itself, but it's easy enough...
>>> od = OrderedDict([('a', 1), ('b', 2)])
>>> '{%s}' % ', '.join('{!r}: {!r}'.format(k, v) for (k, v) in od.items())
"{'a': 1, 'b': 2}"
>>>
It's a bit more work if you want pretty-printing.
And there's always json.
Le ven. 27 juil. 2018 à 07:58, Steven D'Aprano <st...@pearwood.info
<mailto:st...@pearwood.info>> 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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