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Reshape three column data frame to matrix (“long” to “wide” format) [duplicate]
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190
There are many ways to do this. This answer starts with what is quickly becoming the standard...
css transform, jagged edges in chrome
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11 Answers
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What does SQL clause “GROUP BY 1” mean?
...QL query where the GROUP BY clause consisted of the statement: GROUP BY 1 .
6 Answers
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Check if a file exists with wildcard in shell script [duplicate]
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21 Answers
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Find most frequent value in SQL column
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183
SELECT `column`,
COUNT(`column`) AS `value_occurrence`
FROM `my_ta...
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...
Does .NET provide an easy way convert bytes to KB, MB, GB, etc.?
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197
Here is a fairly concise way to do this:
static readonly string[] SizeSuffixes =
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Can I change the checkbox size using CSS?
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15 Answers
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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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How to get the primary IP address of the local machine on Linux and OS X? [closed]
...ould return me the primary (first) IP address of the localhost, other than 127.0.0.1
31 Answers
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