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Pandas dataframe get first row of each group
... 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 second
4 5 first
5 6 first
6 7 fourth
To get n...
Why does (1 in [1,0] == True) evaluate to False?
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answered Feb 14 '12 at 21:26
Sven MarnachSven Marnach
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Crontab Day of the Week syntax
In crontab does the Day of the Week field run from 0 - 6 or 1 -7 ?
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3
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How to create a colored 1x1 UIImage on the iPhone dynamically?
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How to check if all elements of a list matches a condition?
...eth Latty
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Matplotlib different size subplots
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AlexV
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answered Mar 9 '16 at 1:37
HagneHagne
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Error to install Nokogiri on OSX 10.9 Maverick?
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edited Dec 6 '16 at 17:54
Jean
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answered Nov 6 '13 a...
What's the fastest way to merge/join data.frames in R?
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The match approach works when there is a unique key in the second data frame for each key value ...
Interpolating a string into a regex
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edited Aug 16 '17 at 23:06
David Hempy
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