[Python-ideas] Have a "j" format option for lists

[Facundo Batista]

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

Blog: http://www.taniquetil.com.ar/plog/
PyAr: http://www.python.org/ar/
Twitter: @facundobatista