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Replace None with NaN in pandas dataframe
...beware when you run df.replace([None], np.nan, inplace=True), this changed all datetime objects with missing data to object dtypes. So now you may have broken queries unless you change them back to datetime which can be taxing depending on the size of your data.
– Doubledown
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How to change line width in IntelliJ (from 120 character)
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I also like the "Wrap on typing" option. It does all the alignment for me.
– Zajo
Jan 3 '18 at 15:35
3
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IntelliJ IDEA generating serialVersionUID
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I have reinstalled IDEA and removed plug-ins and it helps me. Tnx a lot.
– Kirill Bazarov
Oct 16 '12 at 12:10
5
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Conda: Installing / upgrading directly from github
Can I install/upgrade packages from GitHub using conda ?
4 Answers
4
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Why is MATLAB so fast in matrix multiplication?
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Here's my results using MATLAB R2011a + Parallel Computing Toolbox on a machine with a Tesla C2070:
>> A = rand(1024); gA = gpuArray(A);
% warm up by executing the operations a couple of times, and then:
>> tic, C = A * A; toc
Elapsed time is 0.075396 sec...
SQL Group By with an Order By
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In all versions of MySQL, simply alias the aggregate in the SELECT list, and order by the alias:
SELECT COUNT(id) AS theCount, `Tag` from `images-tags`
GROUP BY `Tag`
ORDER BY theCount DESC
LIMIT 20
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How to convert string to Title Case in Python?
...iends from the UK".title()
"They'Re Bill'S Friends From The Uk"
If you really wanted PascalCase you can use this:
>>> ''.join(x for x in 'make IT pascal CaSe'.title() if not x.isspace())
'MakeItPascalCase'
share...
What is Node.js' Connect, Express and “middleware”?
...t offers a createServer method that extends Connect's Server prototype. So all of the functionality of Connect is there, plus view rendering and a handy DSL for describing routes. Ruby's Sinatra is a good analogy.
Then there are other frameworks that go even further and extend Express! Zappa, for in...
Recursion in Angular directives
...are a couple of popular recursive angular directive Q&A's out there, which all come down to one of the following solutions:
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How do you delete a column by name in data.table?
...hod 3 (could then assign to df3,
df3[, !"foo"]
though if you were actually wanting to remove column "foo" from df3 (as opposed to just printing a view of df3 minus column "foo") you'd really want to use Method 1 instead.
(Do note that if you use a method relying on grep() or grepl(), you need ...