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How to test if list element exists?
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156
This is actually a bit trickier than you'd think. Since a list can actually (with some effort)...
Why is XOR the default way to combine hashes?
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119
Assuming uniformly random (1-bit) inputs, the AND function output probability distribution is ...
How to sort two lists (which reference each other) in the exact same way
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13 Answers
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Is there a ceiling equivalent of // operator in Python?
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edited Sep 14 at 21:47
Machavity♦
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Convert Rows to columns using 'Pivot' in SQL Server
...nt] int
);
INSERT INTO #yt
(
[Store],
[Week], [xCount]
)
VALUES
(102, 1, 96),
(101, 1, 138),
(105, 1, 37),
(109, 1, 59),
(101, 2, 282),
(102, 2, 212),
(105, 2, 78),
(109, 2, 97),
(105, 3, 60),
(102, 3, 123),
(101, 3, 220),
(109, 3, 87);
If your...
Non greedy (reluctant) regex matching in sed?
...egex for this context is pretty easy to get:
perl -pe 's|(http://.*?/).*|\1|'
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How to split the name string in mysql?
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16 Answers
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Pandas get topmost n records within each group
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195
Did you try df.groupby('id').head(2)
Ouput generated:
>>> df.groupby('id').head(2)...
python dataframe pandas drop column using int
I understand that to drop a column you use df.drop('column name', axis=1). Is there a way to drop a column using a numerical index instead of the column name?
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