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Re: More Pythonic implementation

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  Re: More Pythonic implementation Ben Finney <ben+python@benfinney.id.au> - 2014-08-20 09:41 +1000

#76625 — Re: More Pythonic implementation

Shubham Tomar <tomarshubham24@gmail.com> writes:

> Lets say I have a function poker(hands) that takes a list of hands and
> returns the highest ranking hand, and another function hand_rank(hand)
> that takes hand and return its rank.

To make it clearer, I think you mean something like this::

    def hand_rank(hand):
        """ Determine the rank of the poker hand. """
        rank = int(some_complex_computation(hand))
        return rank

In other words, I'm assuming ‘hand_rank’ returns an integer.

> Which of the following is better and more Pythonic ?

Only one of them does anything useful :-)

> def poker(hands):
>     return max(hands, key=hand_rank)

This will return the item from the collection ‘hand’ with the maximum
value as determined by ‘hand_rank’. So this appears to do what you want.

> def poker(hands):
>     return max(hand_rank(hands))

This raises “TypeError: 'int' object is not iterable” because you're
operating on one return value from ‘hand_rank’, which is not a
collection.

-- 
 \       “Corporation, n. An ingenious device for obtaining individual |
  `\       profit without individual responsibility.” —Ambrose Bierce, |
_o__)                                   _The Devil's Dictionary_, 1906 |
Ben Finney

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