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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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follow
...
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...
What is the difference between sites-enabled and sites-available directory?
...is symlinked, the site
configured by it will be active once Apache2 is restarted.
See here https://help.ubuntu.com/lts/serverguide/httpd.html
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...
dplyr: “Error in n(): function should not be called directly”
...e = "lag_value", -c(Stock,Date, Close)) %>%
mutate(lag = str_sub(lag, start = 5) %>% as.numeric) %>%
group_by(Stock, lag) %>%
summarize(
cor = cor(x = Close, y = lag_value, use = "pairwise.complete.obs"),
cutoff_upper = 2/(n())^0.5,
cutoff_lower = -2/(n())^0.5
)
Pos...
Negative weights using Dijkstra's Algorithm
...if you were to store back pointers saying how to get from each node to the start node A, you'd end taking the wrong path back from C to A.
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follo...