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TypeError: 'dict_keys' object does not support indexing
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234
Clearly you're passing in d.keys() to your shuffle function. Probably this was written with py...
What do numbers using 0x notation mean?
...x are hexadecimal integers. (base 16)
The number 0x6400 is 25600.
6 * 16^3 + 4 * 16^2 = 25600
For an example including letters (also used in hexadecimal notation where A = 10, B = 11 ... F = 15)
The number 0x6BF0 is 27632.
6 * 16^3 + 11 * 16^2 + 15 * 16^1 = 27632
24576 + 2816 + 240 ...
Convert a list of data frames into one data frame
... joekliegjoeklieg
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5
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Reordering arrays
...splice(to, 0, this.splice(from, 1)[0]);
};
Then just use:
var ar = [1,2,3,4,5];
ar.move(0,3);
alert(ar) // 2,3,4,1,5
Diagram:
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Add unique constraint to combination of two columns
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223
Once you have removed your duplicate(s):
ALTER TABLE dbo.yourtablename
ADD CONSTRAINT uq_your...
Best practices for exception management in Java or C# [closed]
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answered Jan 3 '09 at 18:49
Brian RasmussenBrian Rasmussen
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Inserting multiple rows in mysql
...ed by commas.
Example:
INSERT INTO tbl_name
(a,b,c)
VALUES
(1,2,3),
(4,5,6),
(7,8,9);
Source
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Finding sum of elements in Swift array
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This is the easiest/shortest method I can find.
Swift 3 and Swift 4:
let multiples = [...]
let sum = multiples.reduce(0, +)
print("Sum of Array is : ", sum)
Swift 2:
let multiples = [...]
sum = multiples.reduce(0, combine: +)
Some more info:
This uses Array's reduce met...
What does “abstract over” mean?
...or example, consider a program that takes the sum of the numbers 1, 2, and 3:
val sumOfOneTwoThree = 1 + 2 + 3
This program is not very interesting, since it's not very abstract. We can abstract over the numbers we're summing, by integrating all lists of numbers under a single symbol ns:
def sum...
Datatable vs Dataset
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edited Apr 30 '15 at 10:31
Hossein Narimani Rad
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