> On Feb 13, 2017, at 12:34, SIJIA CHEN <schen...@wisc.edu> wrote:
>
> I find out that the outcome for using .join() on a dictionary is totally
> different than it using on list or string. for example,
>
>>>> seq4 = {'hello':1,'good':2,'boy':3,'doiido':4}
>>>> print ':'.join(seq4)
> boy:good:doiido:hello
> So my question is why the outcome doesn't show sequentially as the same
> sequence of the original seq4? What pattern do those "keys" of the
> dictionary in the outcome show ?
Dictionaries (in particular, their keys) are unordered. You can not rely on
them to be in a particular sequence. The reason for this, from a practical
perspective, is you are expected to ask for the specific key; you should not
care about the ordering.
Lists, on the other hand, have a specific order by design so will always be in
the order they were created.
What are you trying to do with join() on a dictionary in the first place? Is
there a specific outcome you are trying to get? It’s unlikely that using join
on a dictionary is what you actually want.
—
David Rock
da...@graniteweb.com
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