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Pandas get topmost n records within each group
... value
id
1 0 1 1
1 1 2
2 3 2 1
4 2 2
3 7 3 1
4 8 4 1
(Keep in mind that you might need to order/sort before, depending on your data)
EDIT: As mentioned by the questioner, use df.groupby('id').head(2).reset_index(drop=True) to remo...
What's the difference between “mod” and “remainder”?
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145
There is a difference between modulus and remainder. For example:
-21 mod 4 is 3 because -21 +...
Ruby Hash to array of values
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answered Mar 5 '12 at 0:48
Ray ToalRay Toal
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Getting list of lists into pandas DataFrame
...aders)
df
Heading1 Heading2
0 1 2
1 3 4
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Convert columns to string in Pandas
...refore your keys to strings):
In [11]: df = pd.DataFrame([['A', 2], ['A', 4], ['B', 6]])
In [12]: df.to_json()
Out[12]: '{"0":{"0":"A","1":"A","2":"B"},"1":{"0":2,"1":4,"2":6}}'
In [13]: df[0].to_json()
Out[13]: '{"0":"A","1":"A","2":"B"}'
Note: you can pass in a buffer/file to save this to, al...
How do I reverse a C++ vector?
... Touraille
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answered Jan 16 '12 at 8:46
Ivaylo StrandjevIvaylo Strandjev
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In javascript, is an empty string always false as a boolean?
... settled
– Anthony
Mar 2 '16 at 22:34
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One caveat is that new String("") is truthy! This is bec...
Sass negative variable value?
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answered Nov 8 '12 at 19:44
Zoltan TothZoltan Toth
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Python, Matplotlib, subplot: How to set the axis range?
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As found in http://www.mofeel.net/582-comp-soft-sys-matlab/54166.aspx
pylab.ylim([0,1000])
N...