1. Check conda is installed and in your PATH

1. Open a terminal client.
2. Enter conda -V into the terminal command line and press enter.
3. If conda is installed you should see somehting like the following.

$ conda -V
conda 3.7.0

2. Check conda is up to date

1. In the terminal client enter

conda update conda

1. Upadate any packages if necessary by typing y to proceed.

3. Create a virtual environment for your project

1. In the terminal client enter the following where yourenvname is the name you want to call your environment, and replace x.x with the Python version you wish to use. (To see a list of available python versions first, type conda search "^python$" and press enter.)

conda create -n yourenvname python=x.x anaconda

1. Press y to proceed. This will install the Python version and all the associated anaconda packaged libraries at “path_to_your_anaconda_location/anaconda/envs/yourenvname”

4. Activate your virtual environment.

1. To activate or switch into your virtual environment, simply type the following where yourenvname is the name you gave to your environement at creation.

source activate yourenvname

1. Activating a conda environment modifies the PATH and shell variables to point to the specific isolated Python set-up you created. The command prompt will change to indicate which conda environemnt you are currently in by prepending (yourenvname). To see a list of all your environments, use the command conda info -e.

5. Install additional Python packages to a virtual environment.

1. To install additional packages only to your virtual environment, enter the following command where yourenvname is the name of your environemnt, and [package] is the name of the package you wish to install. Failure to specify “-n yourenvname” will install the package to the root Python installation.

conda install -n yourenvname [package]

6. Deactivate your virtual environment.

1. To end a session in the current environment, enter the following. There is no need to specify the envname - which ever is currently active will be deactivated, and the PATH and shell variables will be returned to normal.

source deactivate

6. Delete a no longer needed virtual environment

1. To delete a conda environment, enter the following, where yourenvname is the name of the environment you wish to delete.

conda remove -n yourenvname -all

A for loop is used for iterating over a sequence

Looping Through a String

num = int(input("Enter a number: "))
if (num % 2) == 0:
   print("{0} is Even".format(num))
else:
   print("{0} is Odd".format(num))

We believe that the potential of machine learning is so vast that every technical person should learn machine learning fundamentals.

HOW TO WATCH, STREAM LA LIGA

• Argon2d maximizes resistance to GPU cracking attacks.

• Argon2i is optimized to resist side-channel attacks. It accesses the memory array in a password independent order.

• Argon2id is a hybrid version. It follows the Argon2i approach for the first pass over memory and the Argon2d approach for subsequent passes.

<h3>$article->comments->count() {{ str_plural('Comment', $article->comments->count())</h3>

<h3>$article->cached_comments_count {{ str_plural('Comment', $article->cached_comments_count)</h3>

Touching Models

$ php artisan tinker

>>> $article = \App\Article::first();
=> App\Article {#746
     id: 1,
     title: "Hello World",
     body: "The Body",
     created_at: "2018-01-11 05:16:51",
     updated_at: "2018-01-11 05:51:07",
   }
>>> $article->updated_at->timestamp
=> 1515649867
>>> $article->touch();
=> true
>>> $article->updated_at->timestamp
=> 1515650910

<?php

namespace App;

use App\Article;
use Illuminate\Database\Eloquent\Model;

class Comment extends Model
{
    protected $guarded = [];

    protected $touches = ['article'];

    public function article()
    {
        return $this->belongsTo(Article::class);
    }
}

The Cached Attribute

public function getCachedCommentsCountAttribute()
{
    return Cache::remember($this->cacheKey() . ':comments_count', 15, function () {
        return $this->comments->count();
    });
}

public function cacheKey()
{
    return sprintf(
        "%s/%s-%s",
        $this->getTable(),
        $this->getKey(),
        $this->updated_at->timestamp
    );
}

articles/1-1515650910

<?php

namespace App;

use App\Comment;
use Illuminate\Support\Facades\Cache;
use Illuminate\Database\Eloquent\Model;

class Article extends Model
{
    public function cacheKey()
    {
        return sprintf(
            "%s/%s-%s",
            $this->getTable(),
            $this->getKey(),
            $this->updated_at->timestamp
        );
    }

    public function comments()
    {
        return $this->hasMany(Comment::class);
    }

    public function getCachedCommentsCountAttribute()
    {
        return Cache::remember($this->cacheKey() . ':comments_count', 15, function () {
            return $this->comments->count();
        });
    }
}

<?php

namespace App;

use App\Article;
use Illuminate\Database\Eloquent\Model;

class Comment extends Model
{
    protected $guarded = [];

    protected $touches = ['article'];

    public function article()
    {
        return $this->belongsTo(Article::class);
    }
}

What’s Next?

public function getCachedCommentsAttribute()
{
    return Cache::remember($this->cacheKey() . ':comments', 15, function () {
        return $this->comments;
    });
}

public function getCachedCommentsAttribute()
{
    return Cache::remember($this->cacheKey() . ':comments', 15, function () {
        return $this->comments->toArray();
    });
}