Chris Angelico <[email protected]> wrote:
> On Tue, Mar 18, 2014 at 11:32 AM, Mok-Kong Shen
> <[email protected]> wrote:
>> Is there a way to force a certain ordering of the printout or else
>> somehow manage to get at least a certain stable ordering of the
>> printout (i.e. input and output are identical)?
>
> Yes; instead of simply printing it out (which calls repr()),
> explicitly iterate over it, like this:
>
> def display(d):
> return '{'+','.join('%r: %r'%(key,d[key]) for key in sorted(d))+'}'
>
[...]
> At least, it's consistent as long as the keys all sort consistently,
> which they will if you use simple strings. Other types of keys may not
> work, and in fact mixing types may cause an exception:
>
>>>> print(display({True:1,"Hello":2}))
> Traceback (most recent call last):
> File "<stdin>", line 1, in <module>
> File "<stdin>", line 2, in display
> TypeError: unorderable types: str() < bool()
>
> But for strings, this is the easiest way to get what you're looking for.
I would say using pprint.pprint is even easier and it works with your
failing example:
>>> pprint.pprint({True:1,"Hello":2})
{True: 1, 'Hello': 2}
Ciao
Marc
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