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PostgreSQL Crosstab Query
Does any one know how to create crosstab queries in PostgreSQL?
For example I have the following table:
6 Answers
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Get absolute path of initially run script
I have searched high and low and get a lot of different solutions and variables containing info to get the absolute path. But they seem to work under some conditions and not under others. Is there one silver bullet way to get the absolute path of the executed script in PHP? For me, the script wil...
How to call Base Class's __init__ method from the child class? [duplicate]
If I have a python class as:
4 Answers
4
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How to convert a string of numbers to an array of numbers?
...ature of split function) but it is equivalent to split(','). The string is now an array, we just have to map each value with a function returning the integer of the string so x=>+x (which is even shorter than the Number function (5 chars instead of 6)) is equivalent to :
function(x){return parse...
Why git can't remember my passphrase under Windows
.... Answer with a y. This will add the server's host key to PuTTY's list of known hosts. Without this step git commands will not work properly. After hitting enter, Github informs you that Github does not provide shell access. That's fine...we don't need it. (If you are connecting to some other host, ...
python: How do I know what type of exception occurred?
...y, it's so that you don't hide:
the fact that an error occurred
the specifics of the error that occurred (error hiding antipattern)
So as long as you take care to do none of those things, it's OK to catch the generic exception. For instance, you could provide information about the exception to ...
How do I send a JSON string in a POST request in Go
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now it have panics on playground. May be you shold fix or update something?
– Altenrion
Jan 4 '17 at 16:02
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RuntimeError on windows trying python multiprocessing
...will import (i.e. execute) the main module at start. You need to insert an if __name__ == '__main__': guard in the main module to avoid creating subprocesses recursively.
Modified testMain.py:
import parallelTestModule
if __name__ == '__main__':
extractor = parallelTestModule.ParallelExt...
How to create a directory using nerdtree
...s 'm'; you should see a menu at the bottom. Type in 'a' for add childnode. Now input the directory you want to create, making sure to add a '/' at the end, otherwise the script would create a file.
AFAIK NERDTree cannot create parent directories like 'mkdir -p' does.
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Hidden features of Scala
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trait Functor[F[_]] {
def fmap[A, B](f: A => B, fa: F[A]): F[B]
}
Now, if you have a Functor[List], you can map over lists. If you have a Functor[Tree], you can map over trees. But more importantly, if you have Functor[A] for any A of kind (*->*), you can map a function over A.
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