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Applying function with multiple arguments to create a new pandas column
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>>> import numpy as np
>>> df = pd.DataFrame({"A": [10,20,30], "B": [20, 30, 10]})
>>> df['new_column'] = np.multiply(df['A'], df['B'])
>>> df
A B new_column
0 10 20 200
1 20 30 600
2 30 10 300
or vectorize arbitrary functi...
How to percent-encode URL parameters in Python?
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Python 2
From the docs:
urllib.quote(string[, safe])
Replace special characters in string
using the %xx escape. Letters, digits,
and the characters '_.-' are never
quoted. By default, this function is
intended for quo...
Is it possible to assign numeric value to an enum in Java?
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217
public enum EXIT_CODE {
A(104), B(203);
private int numVal;
EXIT_CODE(int numVal...
How to do Mercurial's 'hg remove' for all missing files?
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answered Mar 9 '10 at 20:35
mfperzelmfperzel
4,69511 gold badge1414 silver badges1313 bronze badges
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What would cause an algorithm to have O(log log n) complexity?
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2 Answers
2
Active
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How can I combine hashes in Perl?
... the best way to combine both hashes into %hash1? I always know that %hash2 and %hash1 always have unique keys. I would also prefer a single line of code if possible.
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Are tuples more efficient than lists in Python?
... is much faster than assigning a list.
>>> def a():
... x=[1,2,3,4,5]
... y=x[2]
...
>>> def b():
... x=(1,2,3,4,5)
... y=x[2]
...
>>> import dis
>>> dis.dis(a)
2 0 LOAD_CONST 1 (1)
3 LOAD_CONST ...
SQL query to find record with ID not in another table
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216
Try this
SELECT ID, Name
FROM Table1
WHERE ID NOT IN (SELECT ID FROM Table2)
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How does IPython's magic %paste work?
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answered Jun 4 '12 at 19:16
FramesterFramester
24.8k4141 gold badges118118 silver badges181181 bronze badges
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Vim: How to change the highlight color for search hits and quickfix selection
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162
Look at $VIMRUNTIME/colors/desert.vim. Color mappings are defined there with the hi[ghlight] co...