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Group by multiple columns in dplyr, using string vector input
...e so:
data = data.frame(
asihckhdoydkhxiydfgfTgdsx = sample(LETTERS[1:3], 100, replace=TRUE),
a30mvxigxkghc5cdsvxvyv0ja = sample(LETTERS[1:3], 100, replace=TRUE),
value = rnorm(100)
)
# get the columns we want to average within
columns = names(data)[-3]
library(dplyr)
df1 <- data %...
nonlocal keyword in Python 2.x
...turn d['y']
return inner
f = outer()
print(f(), f(), f()) #prints 1 2 3
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Javascript reduce on array of objects
...a variable in the next iteration.
Iteration 1: a = {x:1}, b = {x:2}, {x: 3} assigned to a in Iteration 2
Iteration 2: a = {x:3}, b = {x:4}.
The problem with your example is that you're returning a number literal.
function (a, b) {
return a.x + b.x; // returns number literal
}
Iteration 1: ...
Immutable vs Mutable types
...
233
What? Floats are immutable? But can't I do
x = 5.0
x += 7.0
print x # 12.0
Doesn't that "mut...
What's the difference between `raw_input()` and `input()` in Python 3?
What is the difference between raw_input() and input() in Python 3?
6 Answers
6
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Looping through a hash, or using an array in PowerShell
... property. Here is an example how:
$hash = @{
a = 1
b = 2
c = 3
}
$hash.Keys | % { "key = $_ , value = " + $hash.Item($_) }
Output:
key = c , value = 3
key = a , value = 1
key = b , value = 2
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How can I convert comma separated string into a List
...inkenlight
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Call a function with argument list in python
... func(*args)
def func2(x, y, z):
print x+y+z
wrapper1(func2, 1, 2, 3)
wrapper2(func2, [1, 2, 3])
In wrapper2, the list is passed explicitly, but in both wrappers args contains the list [1,2,3].
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TypeError: module.__init__() takes at most 2 arguments (3 given)
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answered Jan 29 '13 at 14:07
SheenaSheena
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What is the 'pythonic' equivalent to the 'fold' function from functional programming?
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edited Sep 21 '19 at 0:30
goetzc
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answered Apr ...