Problem sorting list of strings - Python

Question

I have a list of strings:

cards = ['2S', '8D', '8C', '4C', 'TS', '9S', '9D', '9C', 'AC', '3D']

and the order in which I want to display the cards:

CARD_ORDER = ['2', '3', '4', '5', '6', '7', '8', '9', 'T', 'J', 'Q', 'K', 'A']

This is how I'm trying to order the list:

sorted(cards, lambda x,y: CARD_ORDER.index(x[0]) >= CARD_ORDER.index(y[0]) )

Unfortunately this does not seem to work....

or more precisely the list stays exactly the same, sorted(cards) works fine instead.

Any ideas?

SilentGhost · Accepted Answer · 2011-01-30 16:00:24Z

8

it's

sorted(cards, key=lambda x: CARD_ORDER.index(x[0]))

key parameter accepts a single value, by which to sort the main iterable. You're probably trying to use cmp parameter which is not recommended for quite some time.

edited Jan 30, 2011 at 16:00

answered Jan 30, 2011 at 15:54

SilentGhost

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2 Comments

RadiantHex Over a year ago

that works thanks, any explanation why the other way does not work?

Liquid_Fire Over a year ago

@RadiantHex, because you are using >= which only returns False or True (0 or 1), whereas the comparison function is expected to return -1, 0 or 1.

Howard · Accepted Answer · 2011-01-30 15:57:00Z

2

Try

sorted(cards, key = lambda x: CARD_ORDER.index(x[0]) )

answered Jan 30, 2011 at 15:57

Howard

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