Return a tuple of arguments to be fed to string.format()

Question

Currently, I’m trying to get a method in Python to return a list of zero, one, or two strings to plug into a string formatter, and then pass them to the string method. My code looks something like this:

class PairEvaluator(HandEvaluator):
  def returnArbitrary(self):
    return ('ace', 'king')

pe = PairEvaluator()
cards = pe.returnArbitrary()
print('Two pair, {0}s and {1}s'.format(cards))

When I try to run this code, the compiler gives an IndexError: tuple index out of range.
How should I structure my return value to pass it as an argument to .format()?

Asked By: Yes – that Jake.

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Source

Answer 1

This attempts to use “cards” as single format input to print, not the contents of cards.

Try something like:

print('Two pair, %ss and %ss' % cards)

Answered By: Andrew Grant

Answer 2

print('Two pair, {0}s and {1}s'.format(*cards))

You are missing only the star 😀

Answered By: Bartosz Radaczyński

Answer 3

Format is preferred over the % operator, as of its introduction in Python 2.6: http://docs.python.org/2/library/stdtypes.html#str.format

It’s also a lot simpler just to unpack the tuple with * — or a dict with ** — rather than modify the format string.

Answered By: trojjer

Return a tuple of arguments to be fed to string.format()

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