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how to check the dtype of a column in python pandas
...y of the question is specific. So any other answers may be used.
But in order to fully answer the title question it should be clarified that it seems like all of the approaches may fail in some cases and require some rework. I reviewed all of them (and some additional) in decreasing of reliabilit...
Why do I have to access template base class members through the this pointer?
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Short answer: in order to make x a dependent name, so that lookup is deferred until the template parameter is known.
Long answer: when a compiler sees a template, it is supposed to perform certain checks immediately, without seeing the templ...
Unix's 'ls' sort by name
...ort. For just a list of file names:
ls -1 | sort
To sort them in reverse order:
ls -1 | sort -r
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Environment variables for java installation
...ramData\Oracle\Java\javapath; from the Path system environment variable in order to have a consistent environment.
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Recursion or Iteration?
... they are designed (Fibonacci sequences, traversing a tree like structure, etc.). Recursion makes the algorithm more succinct and easier to understand (therefore shareable and reusable).
Also, some recursive algorithms use "Lazy Evaluation" which makes them more efficient than their iterative brot...
Is Redis just a cache?
...ps you with all the plumbing on the server side.
Persistence, Reliability etc.
Unlike a Cache, Redis persists data on the hard disk. You can have a master-slave setup to provide better reliability. To learn more, go through Persistence and Replication topics over here - http://redis.io/documentati...
How to access the ith column of a NumPy multidimensional array?
...columns, it could be a good idea to create our array in column-major ('F') order instead of the row-major ('C') order (which is the default), and then do the slicing as before to get a column without copying it:
A = np.asfortranarray(A) # or np.array(A, order='F')
A_c1_ref = A[:, 1]
A_c1_ref.strid...
Can I get the name of the current controller in the view?
... If you have your controller behind a namespace like this: Admin::Orders then controller_name and params[:controller] will be "orders" and "admin/orders" respectively.
– Viktor Fonic
Sep 23 '13 at 8:10
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How do you make lettered lists using markdown?
Markdown allows ordered lists using numbers. How can I instead get an ordered list using letters ? i.e.
5 Answers
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What exactly does += do in python?
...are indeed several others, including bitwise operators (&=, >>=, etc.) and additional math operators (**=, etc.).
– Michael
Dec 21 '17 at 16:12
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