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Array to Hash Ruby
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a = ["item 1", "item 2", "item 3", "item 4"]
h = Hash[*a] # => { "item 1" => "item 2", "item 3" => "item 4" }
That's it. The * is called the splat operator.
One caveat per @Mike Lewis (in the comments): "Be very careful with this. Ruby expands splats on ...
Pandas: drop a level from a multi-level column index?
...tuples([("a", "b"), ("a", "c")])
>>> df = pd.DataFrame([[1,2], [3,4]], columns=cols)
>>> df
a
b c
0 1 2
1 3 4
[2 rows x 2 columns]
>>> df.columns = df.columns.droplevel()
>>> df
b c
0 1 2
1 3 4
[2 rows x 2 columns]
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How do I keep jQuery UI Accordion collapsed by default?
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edited Jan 22 '14 at 16:29
Jarry
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answe...
Django: How to completely uninstall a Django app?
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edited Apr 1 at 19:41
lmiguelvargasf
32.6k2424 gold badges141141 silver badges152152 bronze badges
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NameError: name 'reduce' is not defined in Python
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49
@julio.alegria: Because Guido hates it.
– Ignacio Vazquez-Abrams
Dec 31 '11 at 16:55
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Why are trailing commas allowed in a list?
...er.
– Greg Hewgill
Jul 22 '12 at 6:14
10
@Burhan If you don't believe that explanation, how about...
How to find available versions for a bower dependency
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edited Jan 21 '14 at 11:38
answered Jan 21 '14 at 11:32
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How to show SQL queries run in the Rails console?
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254
Rails 3+
Enter this line in the console:
ActiveRecord::Base.logger = Logger.new(STDOUT)
Rail...
Is it possible to set transparency in CSS3 box-shadow?
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edited May 24 '17 at 20:00
Rory O'Kane
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