Facundo,
I think this is the beginning of a great feature. And it fills a hole in
the
current string formatting. Specifically, we can carefully control the
formatting
of the base data types, but not collections.
I would like to see you flesh out the idea. In particular, I'd like to see you
address cases where:
1. The underlying members in the collection are not strings. Besides the basic
types such as numbers, it would also be nice to be able to apply formats
recursively so that one can construct a string using the attributes of
members that are objects or items or other collections.
2. The ability to handle collections other than simple lists or iterables, such
as dictionaries.
-Ken
On Wed, May 09, 2018 at 09:39:08AM -0300, Facundo Batista wrote:
> This way, I could do:
>
> >>> authors = ["John", "Mary", "Estela"]
> >>> "Authors: {:, j}".format(authors)
> 'Authors: John, Mary, Estela'
>
> In this case the join can be made in the format yes, but this proposal
> would be very useful when the info to format comes inside a structure
> together with other stuff, like...
>
> >>> info = {
> ... 'title': "A book",
> ... 'price': Decimal("2.34"),
> ... 'authors: ["John", "Mary", "Estela"],
> ... }
> ...
> >>> print("{title!r} (${price}) by {authors:, j}".format(**info))
> "A book" ($2.34) by John, Mary, Estela
>
> What do you think?
>
> -- . Facundo
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