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How to get execution time in rails console?
... Jeremy Baker
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answered Aug 19 '10 at 13:35
ShadwellShadwell
31.9k1414 gold...
Float vs Decimal in ActiveRecord
... you do this:
irb:001:0> "%.47f" % (1.0/10)
=> "0.10000000000000000555111512312578270211815834045" # not "0.1"!
whereas if you just do
irb:002:0> (1.0/10).to_s
=> "0.1" # the interprer rounds the number for you
So if you are dealing with small fractions, like compounding interests...
How exactly does a generator comprehension work?
...ach item out of the expression, one by one.
>>> my_list = [1, 3, 5, 9, 2, 6]
>>> filtered_list = [item for item in my_list if item > 3]
>>> print(filtered_list)
[5, 9, 6]
>>> len(filtered_list)
3
>>> # compare to generator expression
...
>>>...
Python Matplotlib figure title overlaps axes label when using twiny
... that the default value is y=1 and the units is "axes fraction", i.e., y=0.5 means the title is in the middle of the axes, and y=0 means the title is just above the bottom of the axes.
– herrlich10
Oct 19 '17 at 12:31
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How can I make pandas dataframe column headers all lowercase?
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5 Answers
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Active
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How to access array elements in a Django template?
... Ned BatchelderNed Batchelder
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3
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Why does [5,6,8,7][1,2] = 8 in JavaScript?
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[1,2,3,4,5,6][1,2,3];
^ ^
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array + — array subscript access operation,
where index is `1,2,3`,
which is an expression that evaluates to `3`.
The seco...
How to get thread id from a thread pool?
I have a fixed thread pool that I submit tasks to (limited to 5 threads). How can I find out which one of those 5 threads executes my task (something like "thread #3 of 5 is doing this task")?
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Ruby Hash to array of values
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265
Also, a bit simpler....
>> hash = { "a"=>["a", "b", "c"], "b"=>["b", "c"] }
=> {...
Why is DarkGray lighter than Gray?
...er to "Silver". However, the W3C defined Gray (more appropriately?) as RGB 50%.
Here's some more Wikipedia on the subject:
Perhaps most unusual of the color clashes between X11 and W3C is the
case of "Gray" and its variants. In HTML, "Gray" is specifically
reserved for the 128 triplet (50% ...