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Creating a new column based on if-elif-else condition
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4 Answers
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Pandas aggregate count distinct
...about either of:
>>> df
date duration user_id
0 2013-04-01 30 0001
1 2013-04-01 15 0001
2 2013-04-01 20 0002
3 2013-04-02 15 0002
4 2013-04-02 30 0002
>>> df.groupby("date").agg({"duration": np.sum, "user_id": pd.Ser...
Move an item inside a list?
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How to move multiple elements? Given a list a = [1,2,3,4,5,6,7,8,9], how to transform it to [1,2,[3,4,5],6,7,8,9]? Can this be done in one step or with a list comprehension?
– g33kz0r
Feb 21 '13 at 19:04
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Why does direction of index matter in MongoDB?
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114
MongoDB concatenates the compound key in some way and uses it as the key in a BTree.
When findi...
How to get a substring of text?
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246
If you have your text in your_text variable, you can use:
your_text[0..29]
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Get value of dynamically chosen class constant in PHP
...57
Brad
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answered May 27 '11 at 2:20
Dan SimonDan ...
Hex representation of a color with alpha channel?
... transparent red. RGB channels are 0-255 or 0%-100%, alpha is 0-1.
In CSS 4*, you can specify the alpha channel using the 7th and 8th characters of an 8 digit hex colour, or 4th character of a 4 digit hex colour (see CSS Level 4 spec*)
As of May 2019, >80% of users can be expected to understand...
emacs zoom in/zoom out
...can do Ctrl+Scroll to zoom in/out. It is useful.
(global-set-key [C-mouse-4] 'text-scale-increase)
(global-set-key [C-mouse-5] 'text-scale-decrease)
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cout is not a member of std
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answered Jul 7 '12 at 14:45
unkulunkuluunkulunkulu
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How to suppress specific MSBuild warning
...as warnings about expressions that always evaluate to true or false
4 (the default) Displays all level 3 warnings plus informational warnings
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