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Efficient way to rotate a list in python
... dedicated rotate() method.
from collections import deque
items = deque([1, 2])
items.append(3) # deque == [1, 2, 3]
items.rotate(1) # The deque is now: [3, 1, 2]
items.rotate(-1) # Returns deque to original state: [1, 2, 3]
item = items.popleft() # deque == [2, 3]
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Check if all values of array are equal
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31 Answers
31
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Pandas dataframe get first row of each group
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>>> df.groupby('id').first()
value
id
1 first
2 first
3 first
4 second
5 first
6 first
7 fourth
If you need id as column:
>>> df.groupby('id').first().reset_index()
id value
0 1 first
1 2 first
2 3 first
3 4 seco...
Can I change the checkbox size using CSS?
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15 Answers
15
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Sort hash by key, return hash in Ruby
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10 Answers
10
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Naming returned columns in Pandas aggregate function? [duplicate]
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107
This will drop the outermost level from the hierarchical column index:
df = data.groupby(...)...
is it possible to evenly distribute buttons across the width of an android linearlayout
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19 Answers
19
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How do I force make/GCC to show me the commands?
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edited Jan 8 '17 at 4:43
Steven Penny
76.1k4545 gold badges296296 silver badges336336 bronze badges
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How to convert a scala.List to a java.util.List?
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import scala.collection.jcl.ArrayList
unconvertList(new ArrayList ++ List(1,2,3))
From Scala 2.8 onwards:
import scala.collection.JavaConversions._
import scala.collection.mutable.ListBuffer
asList(ListBuffer(List(1,2,3): _*))
val x: java.util.List[Int] = ListBuffer(List(1,2,3): _*)
However, a...
How to normalize a NumPy array to within a certain range?
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140
audio /= np.max(np.abs(audio),axis=0)
image *= (255.0/image.max())
Using /= and *= allows yo...