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Favourite performance tuning tricks [closed]
...re you using row or page level locking?
Lock the tables exclusively before starting the query
Check that all processes are accessing tables in the same order
Are indices being used appropriately?
Joins will only use index if both expressions are exactly the same data type
Index will only be use...
How to drop into REPL (Read, Eval, Print, Loop) from Python code
...hell = IPShellEmbed()
ipshell() # this call anywhere in your program will start IPython
You should use IPython, the Cadillac of Python REPLs. See http://ipython.org/ipython-doc/stable/interactive/reference.html#embedding-ipython
From the documentation:
It can also be useful in scientific
c...
Why is argc not a constant?
As Effective C++ Item#3 states "Use const whenever possible", I start thinking "why not make these 'constant' parameters const "?.
...
Django in / not in query
...rite a custom lookup for Django queries:
From the documentation:
"Let’s start with a simple custom lookup. We will write a custom lookup ne which works opposite to exact. Author.objects.filter(name__ne='Jack') will translate to the SQL: "author"."name" <> 'Jack'"
from django.db.models impo...
Using Vim's persistent undo?
...ndo
try
set undodir=C:\vim\undodir
set undofile
catch
endtry
It started working as advertised when I deleted the try-catch bracket, thus:
" Persistent undo
set undodir=C:\vim\undodir
set undofile
I had to create the directory.
...
Remove unwanted parts from strings in a column
...aracters length is more than 8 characters and I was keep only 8 characters starting from first which should include (-) and (.) also.
– Sitz Blogz
Mar 2 '17 at 3:21
add a comm...
Escaping a forward slash in a regular expression
...rise to the level of being considered a hindrance to legibility, but if it starts to get out of hand, and if your language permits alternate delimiters as Perl does, that would be the preferred solution.
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...
How to identify numpy types in python?
...fferent data types, this small check can serve as a quick test before your start some numpy vectorized operation.
##################
# important part!
##################
import numpy as np
####################
# toy array for demo
####################
arr = np.asarray(range(1,100,2))
#######...
OSGi: What are the differences between Apache Felix and Apache Karaf?
...izes.
Really, for 99% of the projects out there it wouldn't make sense to start directly with Felix and not use Karaf instead.
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...
Including another class in SCSS
...:
[class^="your-class-name"]{
//your style here
}
Whereas every class starting with "your-class-name" uses this style.
So in your case, you could do it like so:
[class^="class"]{
display: inline-block;
//some other properties
&:hover{
color: darken(#FFFFFF, 10%);
}
}
.class-b...