Say you have a library website, and you want to have a custom post type named Books. It can be registered as
function create_bookposttype() {
$args = array(
'public' => true,
'labels' => array(
'name' => __( 'Books' ),
'singular_name' => ...
The following program says hello to the user. It takes one positional argument, the name of the user, and can also be told the greeting.
import argparse
parser = argparse.ArgumentParser()
parser.add_argument('name',
help='name of user'
)
parser.add_argument('-g', '--greeting',
...
To join two or more path components together, firstly import os module of python and then use following:
import os
os.path.join('a', 'b', 'c')
The advantage of using os.path is that it allows code to remain compatible over all operating systems, as this uses the separator appropriate for the pl...
To split one component off of the path:
>>> p = os.path.join(os.getcwd(), 'foo.txt')
>>> p
'/Users/csaftoiu/tmp/foo.txt'
>>> os.path.dirname(p)
'/Users/csaftoiu/tmp'
>>> os.path.basename(p)
'foo.txt'
>>> os.path.split(os.getcwd())
('/Users/csafto...
Every package requires a setup.py file which describes the package.
Consider the following directory structure for a simple package:
+-- package_name
| |
| +-- __init__.py
|
+-- setup.py
The __init__.py contains only the line def foo(): return 100.
The following setup.py...
To find every vector of the form (x, y) where x is drawn from vector X and y from Y, we use expand.grid:
X = c(1, 1, 2)
Y = c(4, 5)
expand.grid(X, Y)
# Var1 Var2
# 1 1 4
# 2 1 4
# 3 2 4
# 4 1 5
# 5 1 5
# 6 2 5
The result is a data.frame with one...
unique drops duplicates so that each element in the result is unique (only appears once):
x = c(2, 1, 1, 2, 1)
unique(x)
# 2 1
Values are returned in the order they first appeared.
duplicated tags each duplicated element:
duplicated(x)
# FALSE FALSE TRUE TRUE TRUE
anyDuplicated(x) >...
To count how many elements of two sets overlap, one could write a custom function:
xtab_set <- function(A, B){
both <- union(A, B)
inA <- both %in% A
inB <- both %in% B
return(table(inA, inB))
}
A = 1:20
B = 10:30
xtab_set(A, B)
# inB
...
Imagine you have the following HTML:
<div>
<label>Name:</label>
John Smith
</div>
And you need to locate the text "John Smith" after the label element.
In this case, you can locate the label element by text and then use .next_sibling property:
from ...
BeautifulSoup has a limited support for CSS selectors, but covers most commonly used ones. Use select() method to find multiple elements and select_one() to find a single element.
Basic example:
from bs4 import BeautifulSoup
data = """
<ul>
<li class="item&quo...
You can restrict the valid types used in a generic class by bounding that type in the class definition. Given the following simple type hierarchy:
public abstract class Animal {
public abstract String getSound();
}
public class Cat extends Animal {
public String getSound() {
...
Sometimes it's necessary to be able to extract values from an object using only references (ie. without transferring ownership).
struct Token {
pub id: u32
}
struct User {
pub token: Option<Token>
}
fn main() {
// Create a user with an arbitrary token
let user = User...
Let's say we have the following data:
>>> data = {"cats": [{"name": "Tubbs", "color": "white"}, {"name": "Pepper", "color": "black"}]}
Just dumping this as JSON does not do anything special here:
...
Have a table
NameAgeCityBob10ParisMat20BerlinMary24Prague
select Name from table where Age>10 AND City='Prague'
Gives
NameMary
select Name from table where Age=10 OR City='Prague'
Gives
NameBobMary
All built-in Clojure collections are immutable and heterogeneous, have literal syntax, and support the conj, count, and seq functions.
conj returns a new collection that is equivalent to an existing collection with an item "added", in either "constant" or logarithmic time. Wha...
A sequence is very much like a list: it is an immutable object that can give you its first element or the rest of its elements in constant time. You can also construct a new sequence from an existing sequence and an item to stick at the beginning.
You can test whether something is a sequence using ...
For if you have to fine-tune what is published.
import { Mongo } from 'meteor/mongo';
import { Meteor } from 'meteor/meteor';
import { Random } from 'meteor/random';
if (Meteor.isClient) {
// established this collection on the client only.
// a name is required (first parameter) and this...
On the server, you can create a publication like this. this.userId is the id of the user who is currently logged in. If no user is logged in, you might want to throw an error and respond to it.
import Secrets from '/imports/collections/Secrets';
Meteor.publish('protected_data', function () {
...
You can take a snapshot from a UIView like this:
Swift
let snapshot = view.snapshotView(afterScreenUpdates: true)
Objective-C
UIView *snapshot = [view snapshotViewAfterScreenUpdates: YES];
