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

Facundo Batista facundobatista at gmail.com
Wed May 9 08:39:08 EDT 2018

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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