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Pandas: create two new columns in a dataframe with values calculated from a pre-existing column
... return x*2, x*3
...:
In [3]: df = DataFrame({'a': [1,2,3], 'b': [2,3,4]})
In [4]: df
Out[4]:
a b
0 1 2
1 2 3
2 3 4
In [5]: df["A1"], df["A2"] = zip(*df["a"].map(calculate))
In [6]: df
Out[6]:
a b A1 A2
0 1 2 2 3
1 2 3 4 6
2 3 4 6 9
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How do I clone a GitHub wiki?
...joseph.hainlinejoseph.hainline
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Difference between var_dump,var_export & print_r
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194
var_dump is for debugging purposes. var_dump always prints the result.
// var_dump(array('', fa...
ASP.NET web.config: configSource vs. file attributes
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304
file attribute
Specifies a relative path to an external file that contains custom application ...
Moq: Invalid setup on a non-overridable member: x => x.GetByTitle(“asdf”)
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154
In order to control the behavior of a mock object (in Moq, at least), you either need to mock an...
How to truncate string using SQL server
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edited Aug 2 '18 at 9:04
marsze
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answered Feb ...
How to pass the -D System properties while testing on Eclipse?
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134
Run -> Run configurations, select project, second tab: “Arguments”. Top box is for your p...
How to import existing *.sql files in PostgreSQL 8.4?
I am using PostgreSQL 8.4, and I have some *.sql files to import into a database. How can I do so?
5 Answers
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“Wrong type argument: commandp” error when binding a lambda to a key
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Stefan
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answered Aug 9 '09 at 7:04
brendanbrendan
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How do I undo a checkout in git?
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answered Aug 30 '10 at 15:41
AmberAmber
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