Tutorial by Examples: l

Usually authentication&authorization processes are performed by built-in cookie and token supports in .net MVC. But if you decide to do it yourself with Session you can use below logic for both page requests and ajax requests. public class SessionControl : ActionFilterAttribute { public o...

arr = np.arange(7) print(arr) # Out: array([0, 1, 2, 3, 4, 5, 6]) Comparison with a scalar returns a boolean array: arr > 4 # Out: array([False, False, False, False, False, True, True], dtype=bool) This array can be used in indexing to select only the numbers greater than 4: arr[arr&...

# Generates 5 random numbers from a uniform distribution [0, 1) np.random.rand(5) # Out: array([ 0.4071833 , 0.069167 , 0.69742877, 0.45354268, 0.7220556 ])

letters = list('abcde') Select three letters randomly (with replacement - same item can be chosen multiple times): np.random.choice(letters, 3) ''' Out: array(['e', 'e', 'd'], dtype='<U1') ''' Sampling without replacement: np.random.choice(letters, 3, replace=False) ''' Out...

Install npm is bundled with Node.js, so if you install Node.js you'll automatically have npm installed too. You can choose between a Current and a LTS version Windows For Microsoft Windows you can download a MSI installer from https://nodejs.org/en/download/. OS X For Apple OS X you can downloa...

A variable of a reference type can hold either a valid reference to an instance or a null reference. The null reference is the default value of reference type variables, as well as nullable value types. null is the keyword that represents a null reference. As an expression, it can be used to assig...

drush dl drupal --drupal-project-rename=example cd example drush site-install standard --db-url='mysql://[db_user]:[db_pass]@localhost/[db_name]' --site-name=Example

In the condition of the for and while loops, it's also permitted to declare an object. This object will be considered to be in scope until the end of the loop, and will persist through each iteration of the loop: for (int i = 0; i < 5; ++i) { do_something(i); } // i is no longer in scope...

If your class doesn't implement a specific overloaded operator for the argument types provided, it should return NotImplemented (note that this is a special constant, not the same as NotImplementedError). This will allow Python to fall back to trying other methods to make the operation work: When...

While The most trivial loop type. Only drawback is there is no intrinsic clue to know where you are in the loop. /// loop while the condition satisfies while(condition) { /// do something } Do Similar to while, but the condition is evaluated at the end of the loop instead of the beginn...

iex([email protected])> Node.list [:"[email protected]"]

Files and directories (another name for folders) are at the heart of Linux, so being able to create, view, move, and delete them from the command line is very important and quite powerful. These file manipulation commands allow you to perform the same tasks that a graphical file explorer would perfo...

Use the HTML or <audio> element to embed video/audio content in a document. The video/audio element contains one or more video/audio sources. To specify a source, use either the src attribute or the <source> element; the browser will choose the most suitable one. Audio tag example: &...

By recursion let rec sumTotal list = match list with | [] -> 0 // empty list -> return 0 | head :: tail -> head + sumTotal tail The above example says: "Look at the list, is it empty? return 0. Otherwise it is a non-empty list. So it could be [1], [1; 2], [1; 2; 3] ...

You can open several content managers at the same time: with open(input_path) as input_file, open(output_path, 'w') as output_file: # do something with both files. # e.g. copy the contents of input_file into output_file for line in input_file: output_file.write(line...

Code that uses generics has many benefits over non-generic code. Below are the main benefits Stronger type checks at compile time A Java compiler applies strong type checking to generic code and issues errors if the code violates type safety. Fixing compile-time errors is easier than fixing runt...

Install the necessary Python Library via: $ pip install elasticsearch Connect to Elasticsearch, Create a Document (e.g. data entry) and "Index" the document using Elasticsearch. from datetime import datetime from elasticsearch import Elasticsearch # Connect to Elasticsearch using ...

Example uses basic HTTP syntax. Any <#> in the example should be removed when copying it. You can use the _cat APIs to get a human readable, tabular output for various reasons. GET /_cat/health?v <1> The ?v is optional, but it implies that you want "verbose" output. _...

Free version of SSH protocol implementation, OpenSSH is available in all the Linux distributions. It consists of the server and client packages. Installation On Debian-based Linux, you can install openssh using # apt-get install openssh-server openssh-client On RHEL/CentOS you need to use yum:...

One can select rows and columns of a dataframe using boolean arrays. import pandas as pd import numpy as np np.random.seed(5) df = pd.DataFrame(np.random.randint(100, size=(5, 5)), columns = list("ABCDE"), index = ["R" + str(i) for i in range(5)]) print (...