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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 to File.listFiles in alphabetical order?
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4 Answers
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How do I convert a Ruby class name to a underscore-delimited symbol?
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Newline in JLabel
...eitassfreitass
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4
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Permanently Set Postgresql Schema Path
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answered May 20 '10 at 16:14
Milen A. RadevMilen A. Radev
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How do I get a string format of the current date time, in python?
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Difference between CSS3 transitions' ease-in and ease-out
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edited Feb 12 '14 at 2:40
answered Mar 9 '12 at 15:03
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How to allow keyboard focus of links in Firefox?
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doppelgreener
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answered Jul 29 '12 at 22:27
BenBen
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What does java:comp/env/ do?
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Quoting https://web.archive.org/web/20140227201242/http://v1.dione.zcu.cz/java/docs/jndi-1.2/tutorial/beyond/misc/policy.html
At the root context of the namespace
is a binding with the name "comp",
which is bound to a subtree reserved
for component-relat...
Can't find how to use HttpContent
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edited Feb 22 '17 at 15:40
answered Jun 29 '14 at 9:11
Yo...