Dinesh B Vadhia wrote:
Thanks Steve. How do you sort on the second element of each list to get:
a' = [[42, 'fish'],
[1, 'hello']
[2, 'world']
]
something like this would do the trick:
a_prime = sorted(a, key=(lambda i: i[1]))
sorted(a) returns a new list consisting of the elements in a
but in sorted order. the key= parameter says how to derive the
sort key from any given element; in this case, the elements
being sorted are themselves lists, and element #1 in the sub-list
(a.k.a. "row") is the key.
From: Steve Willoughby
Sent: Monday, September 22, 2008 8:16 PM
To: Dinesh B Vadhia
Cc: tutor@python.org
Subject: Re: [Tutor] array of different datatypes
Dinesh B Vadhia wrote:
I have looked (honestly!) and cannot see an array structure to allow different datatypes per column. I need a 2 column array with column 1 = an integer and column 2 = chars, and after populating the array, sort on column 2 with column 1 sorted relatively.
If by "array" you mean a regular Python list, the data type of
every single element may be different. So it's just how lists
always work.
a = [[1, 'hello'],
[2, 'world'],
[42, 'fish'],
]
Thanks!
Dinesh
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