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-- Add the columns created_at & modified_at to your required table.
ALTER TABLE 
  table_name 
ADD 
  COLUMN created_at DATETIME NULL
ADD 
  COLUMN modified_at DATETIME NULL;

-- Initialize the data with the current timestamp.
UPDATE 

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from bs4 import BeautifulSoup
import random
import requests

USER_AGENT_SCRAPER_BASE_URL = 'http://www.useragentstring.com/pages/useragentstring.php?name='

POPULAR_BROWSERS = ['Chrome', 'Firefox', 'Mozilla', 'Safari', 'Opera', 'Opera Mini', 'Edge', 'Internet Explorer']

def get_user_agent_strings_for_this_browser(browser):
    """

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from lxml.html import fromstring
import random
import requests
    
def get_proxies():
    """
    Gather a list of some active proxies from https://free-proxy-list.net/
    :return: List of IP Addresses
    """

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Checking for existing SSH keys

Before you generate an SSH key, you can check to see if you have any existing SSH keys.
1. Open Terminal
2. Enter ls -al ~/.ssh to see if existing SSH keys are present. This lists the files in your .ssh directory, if they exist. Check the directory listing to see if you already have a public SSH key.

If you don't have an existing public and private key pair, or don't wish to use any that are available to connect to GitHub, then generate a new SSH key.

If you receive an error that ~/.ssh doesnt exist, dont worry! We will create it when we generate a new SSH key.

Generating a new SSH key

After you've checked for existing SSH keys, you can generate a new SSH key to use for authentication
1. Open Terminal

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# Configuration options are limited to SSL/TLS

# Enable SSL session caching for improving performance by avoiding the costly session negotiation process where possible
# SSL Labs doesn't assume that SNI is available to the client, so it only tests the default virtual server
# setting this globally to make it work across all the nginx virtual servers (including the default virtual server)
ssl_session_cache shared:ssl_session_cache:10m;
ssl_session_timeout 10m;

server {
        listen 443 ssl;

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(Reference:https://www.digitalocean.com/community/tutorials/how-to-serve-django-applications-with-uwsgi-and-nginx-on-ubuntu-16-04)

Create an instance, make sure you have allowed HTTP and HTTPS ports.
sudo apt-get update
sudo apt-get install python-pip python-dev
sudo -H pip install virtualenv virtualenvwrapper
sudo nano .bashrc
Add the following:
export WORKON_HOME=/home/ubuntu/.virtualenvs
source /usr/local/bin/virtualenvwrapper.sh

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class Singleton:


    objects_created = 0
    
    def __new__(cls,*args,**kwargs):

        if cls.objects_created >= 1:
            raise ValueError("This is a Singleton Class, can't create more objects!")