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How do I find a “gap” in running counter with SQL?
...rt into artificial_range( name ) select name from artificial_range;
-- you now have two rows
insert into artificial_range( name ) select name from artificial_range;
-- you now have four rows
insert into artificial_range( name ) select name from artificial_range;
-- you now have eight rows
--etc.
...
Difference between __getattr__ vs __getattribute__
...efined. In the following example my class Count has no __getattr__ method. Now in main when I try to access both obj1.mymin and obj1.mymax attributes everything works fine. But when I try to access obj1.mycurrent attribute -- Python gives me AttributeError: 'Count' object has no attribute 'mycurrent...
OpenCV C++/Obj-C: Detecting a sheet of paper / Square Detection
...mplemented the OpenCV square-detection example in my test application, but now need to filter the output, because it's quite messy - or is my code wrong?
...
VIM + JSLint?
...tput a error list that can be used with the VIM quickfix window (:copen).
Now set the following in VIM:
set makeprg=cat\ %\ \\\|\ /my/path/to/js\ /my/path/to/mylintrun.js\ %
set errorformat=%f:%l:%c:%m
where you have to change /my/path/to/js to the path to SpiderMonkey and /my/path/to/mylintrun....
SQL query for today's date minus two months
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If you use MySQL this would become: MyDate < DATE_ADD(NOW(), INTERVAL -2 MONTH)
– Stefan
Feb 27 '14 at 15:51
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How to install Java 8 on Mac
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As of December 2015, it is now unnecessary to install cask manually as it is now part of homebrew's installation. So after updating homebrew via brew update, you are set to use brew cask.
– davetw12
Dec 16 '15 at ...
Format a datetime into a string with milliseconds
...hind seconds), use this:
from datetime import datetime
print datetime.utcnow().strftime('%Y-%m-%d %H:%M:%S.%f')[:-3]
>>>> OUTPUT >>>>
2020-05-04 10:18:32.926
Note: For Python3, print requires parentheses:
print(datetime.utcnow().strftime('%Y-%m-%d %H:%M:%S.%f')[:-3])
...
Why does struct alignment depend on whether a field type is primitive or user-defined?
...lds, clases obviously cannot do that so they will remain 8 byte aligned.
Now if we combine all that and create struct:
struct RefAndTwoInt32Wrappers
{
public int x,y;
public Int32Wrapper z;
public string s;
}
It will have 24 bytes {x,y} will have 4 bytes each and {z,s} will have 8 b...
Is there an equivalent of 'which' on the Windows command line?
...
@mawg, the original was for where you know the extension since it mirrors which under UNIX (where that extension-adding trickery doesn't occur). I've now added one which can do what you wish but it's no longer a simple command so much as a script. It first tries t...
Why is rbindlist “better” than rbind?
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rbindlist is an optimized version of do.call(rbind, list(...)), which is known for being slow when using rbind.data.frame
Where does it really excel
Some questions that show where rbindlist shines are
Fast vectorized merge of list of data.frames by row
Trouble converting long list of data.fra...