03. Deploying Flask App on Heroku.ipynb

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    "# <center>WhatsApp Bot using Twilio and Python (Part-3)</center><br><center><i><u>Deploying Flask App on Heroku</u></i></center>\n",
    "\n",
    "![](images/1.png)"
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    "![](images/heroku.jpg)\n",
    "\n",
    ">*Heroku is a platform as a service (PaaS) that enables developers to build, run, and operate applications entirely in the cloud.*\n",
    "\n",
    "\n",
    "### Create some new files for Heroku deployment\n",
    "\n",
    "#### 1. Procfile\n",
    "A Procfile is a mechanism for declaring what commands are run by your application's dynos on the Heroku platform.\n",
    "\n",
    "```\n",
    "web gunicorn app:app\n",
    "```\n",
    "\n",
    "Also, install `gunicorn` in your virtual environment:\n",
    "```\n",
    "pip install gunicorn\n",
    "```\n",
    "\n",
    "\n",
    "\n",
    "#### 2. runtime.txt\n",
    "\n",
    "To specify a particular version of Python via your app's runtime.txt\n",
    "\n",
    "```\n",
    "python-3.7.2\n",
    "```\n",
    "\n",
    "#### 3. requirements.txt\n",
    "\n",
    "Contains all 3rd party libraries required by your app.\n",
    "\n",
    "Simply do:\n",
    "```\n",
    "pip freeze > requirements.txt\n",
    "```\n",
    "\n",
    "to generate a **requirements.txt** file.\n",
    "\n",
    "#### 4. .gitignore\n",
    "\n",
    ".gitignore file specifies patterns which are used to exclude certain files in your working directory from your Git history.\n",
    "\n",
    "```\n",
    "myvenv/\n",
    "*.pyc\n",
    "```\n",
    "\n",
    "---------\n",
    "\n",
    "### Now, its time to create a Heroku app!\n",
    "\n",
    "\n",
    "#### 1. Setup Git repository ([Download](https://git-scm.com/downloads))\n",
    "\n",
    "- Initialize a new git repository in your project folder.\n",
    "```\n",
    "git init\n",
    "```\n",
    "    \n",
    "- Add all untracked files to git repository by:\n",
    "```\n",
    "git add .\n",
    "```\n",
    "    \n",
    "- Commit the changes to git repository by:\n",
    "```\n",
    "git commit -m \"YOUR_COMMIT_MESSAGE_HERE\"\n",
    "```\n",
    "    \n",
    "#### 2. Create a new [heroku account](https://signup.heroku.com/)\n",
    "\n",
    "\n",
    "#### 3. Download [Heroku CLI](https://devcenter.heroku.com/articles/heroku-cli#download-and-install).\n",
    "\n",
    "\n",
    "#### 4. Create a new Heroku app.\n",
    "```\n",
    "heroku create <your-app-name>\n",
    "```\n",
    "\n",
    "\n",
    "#### 5. Finally, you are ready to deploy your app by pushing your *local git repository* to the remote *heroku app's git repository* by: \n",
    "```\n",
    "git push heroku master\n",
    "```\n",
    "    \n",
    "#### 6. To check the logs of your heroku app:\n",
    "```\n",
    "heroku logs\n",
    "```\n",
    "\n",
    "### Now, reset the webhook URL of your sandbox with the URL of your heroku app."
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