Comments on: Python is still awesome

By: w1sh

w1sh — Tue, 14 Sep 2010 20:58:19 +0000

In calculator it’s:
1+2+3+4

Beat that.

By: galacticsurfer

galacticsurfer — Thu, 17 Jun 2010 14:16:33 +0000

lol a bit late now i gues but heres my approach

d = [{'value':1, 'title':'one'}, {'value':2}, {'value':3},
{'value':4, 'title':'four'}, ]

for i in d:
s+=i['value']

By: Spacebat

Spacebat — Sun, 17 Feb 2008 02:32:49 +0000

Perl without strict mode:
@d=({value=>1, title=>”one”}, {value=>2}, {value=>3}, {value=>4, title=>”four”});
$s+=$_->{value} for @d;

By: random_p

random_p — Sat, 16 Feb 2008 22:28:25 +0000

The original example didn’t make a whole lot of sense. It could have been simply:

d = {1:’one’, 2:”, 3:”, 4:’four’}
s = sum(d)

or if you needed multiple attributes per item:

d={1:{’title’:'one’, ‘foo’:'bar’}, 2:{}, 3:{}, 4:{’title’:'two’}}
s = sum{d)

By: Language comparisons are always flawed — Quick off the Mark

Language comparisons are always flawed — Quick off the Mark — Sat, 16 Feb 2008 04:48:10 +0000

[...] example is a post “Python is still awesome” where problem X is “Given a list of dictionaries, sum the values of one of the dictionary [...]

By: Simon Harrer

Simon Harrer — Sat, 16 Feb 2008 01:03:45 +0000

reduced to: name l = foldr1 (+) (map snd l)

By: Simon Harrer

Simon Harrer — Sat, 16 Feb 2008 01:00:46 +0000

name l = foldr1 (+) (map (\(a,b) -> b) l)

this is the solution in haskell. is also very short. first a list of only the second part of the pair is created and then the elements of the list are added by the (+) function.

how to use the function:
name [("one",1),("",2),("",3),("",4)]
result: 10

By: Mark Thomas

Mark Thomas — Fri, 15 Feb 2008 17:52:16 +0000

In Ruby on Rails:

s = d.collect{|item| item[:value]}.sum

Of course in Ruby it’s just as easy (and much cleaner IMHO) to create real objects instead of arrays-of-arrays-of-hashes, etc. in which case you would do:

s = d.collect(&:value).sum

Very readable.

By: Shane O'Sullivan

Shane O'Sullivan — Fri, 15 Feb 2008 13:07:45 +0000

How about some functional programming with JavaScript with Dojo?

var values = [{'value':1, 'title':'one'}, {'value':2}, {'value':3},{'value':4, 'title':'four'}];
var sum = dojox.lang.functional.reduce(values, “{value:a['value']+b['value']}”).value;

By: Code Metaphor — Phunctional도 좋아요

Code Metaphor — Phunctional도 좋아요 — Fri, 15 Feb 2008 00:30:43 +0000

[...] Python is steel awesome이라는 글을 보고 생각나서 적습니다. [...]