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Slicing of a NumPy 2d array, or how do I extract an mxm submatrix from an nxn array (n>m)?
...The buffer assigned to x will contain 16 ascending integers from 0 to 15. If you access one element, say x[i,j], NumPy has to figure out the memory location of this element relative to the beginning of the buffer. This is done by calculating in effect i*x.shape[1]+j (and multiplying with the size ...
Cleanest way to get last item from Python iterator
... is precisely what None is for. Are you suggesting that some function-specific default value could even be correct? If the iterator doesn't actually iterate, then an out-of-band value is more meaningful than some misleading function-specific default.
– S.Lott
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How to cherry-pick multiple commits
...mit A to commit B (where A is older than B), run:
git cherry-pick A^..B
If you want to ignore A itself, run:
git cherry-pick A..B
(Credit goes to damian, J. B. Rainsberger and sschaef in the comments)
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Get the current git hash in a Python script
... This has the drawback that the version printing code will be broken if the code is ever run without the git repo present. For example, in production. :)
– JosefAssad
Feb 20 '13 at 21:18
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Add a prefix string to beginning of each line
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# If you want to edit the file in-place
sed -i -e 's/^/prefix/' file
# If you want to create a new file
sed -e 's/^/prefix/' file > file.new
If prefix contains /, you can use any other character not in prefix, or
escape t...
ASP.NET custom error page - Server.GetLastError() is null
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If you store it in the application, what about all the other users of the system. Shouldn't it be in the session?
– BrianK
Aug 7 '09 at 1:40
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What should every developer know about databases? [closed]
Whether we like it or not, many if not most of us developers either regularly work with databases or may have to work with one someday. And considering the amount of misuse and abuse in the wild, and the volume of database-related questions that come up every day, it's fair to say that there are ce...
jQuery - checkbox enable/disable
I have a bunch of checkboxes like this. If the "Check Me" checkbox is checked, all the other 3 checkboxes should be enabled, else they should be disabled. How can I do this using jQuery?
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Is there a performance difference between CTE , Sub-Query, Temporary Table or Table Variable?
In this excellent SO question , differences between CTE and sub-queries were discussed.
4 Answers
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Why is $$ returning the same id as the parent process?
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Shouldn't the second bullet be kill -0 $! if we're talking about background processes? PID isn't set to anything by default.
– Isaac Freeman
Sep 12 '19 at 22:27
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