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Comparing two dataframes and getting the differences
...gt;> df.reindex(idx)
Date Fruit Num Color
9 2013-11-25 Orange 8.6 Orange
8 2013-11-25 Apple 22.1 Red
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Pandas index column title or name
...n [10]: df
Out[10]:
Column 1
foo
Apples 1
Oranges 2
Puppies 3
Ducks 4
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What's the difference between Ruby's dup and clone methods?
...e
@color = 'red'
end
end
apple = Apple.new
apple.color
=> "red"
orange = apple.clone
orange.color
=> "red"
orange.color << ' orange'
=> "red orange"
apple.color
=> "red orange"
Notice in the above example, the orange clone copies the state (that is, the instance vari...
Scala how can I count the number of occurrences in a list
...hat cleaner version of one of the other answers is:
val s = Seq("apple", "oranges", "apple", "banana", "apple", "oranges", "oranges")
s.groupBy(identity).mapValues(_.size)
giving a Map with a count for each item in the original sequence:
Map(banana -> 1, oranges -> 3, apple -> 3)
The...
Rails migration for has_and_belongs_to_many join table
...to be joined by has_and_belongs_to_many are already in the DB : apples and oranges:
create_table :apples_oranges, :id => false do |t|
t.references :apple, :null => false
t.references :orange, :null => false
end
# Adding the index can massively speed up join tables. Don't use the
# uni...
Get column index from column name in python pandas
... .get_loc():
In [45]: df = DataFrame({"pear": [1,2,3], "apple": [2,3,4], "orange": [3,4,5]})
In [46]: df.columns
Out[46]: Index([apple, orange, pear], dtype=object)
In [47]: df.columns.get_loc("pear")
Out[47]: 2
although to be honest I don't often need this myself. Usually access by name does ...
Linux command or script counting duplicated lines in a text file?
...cal, ordered list:
echo "red apple
> green apple
> green apple
> orange
> orange
> orange
> " | sort -u
?
green apple
orange
red apple
or
sort -u FILE
-u stands for unique, and uniqueness is only reached via sorting.
A solution which preserves the order:
echo "red appl...
Why does “split” on an empty string return a non-empty array?
...
If you split an orange zero times, you have exactly one piece - the orange.
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How to automatically generate N “distinct” colors?
... slightly mint green) is imperceptible, while the difference between 30° (orange) and 45° (peach) is quite obvious. You need a non-linear spacing along the hue for best results.
– Phrogz
Feb 21 '12 at 17:05
...
How can I explode and trim whitespace?
..._split ('/(\s*,*\s*)*,+(\s*,*\s*)*/', 'red, green thing ,, ,, blue ,orange');
Result:
Array
(
[0] => red
[1] => green thing
[2] => blue
[3] => orange
)
This
Splits on commas only
Trims white spaces from each item.
Ignores empty items
Does not split an item...