Automating My Car Search - Python & GitHub Actions

Python and GitHub Actions Automation

Adam's photo
Adam
·

5 min read

Automating My Car Search - Python & GitHub Actions

Photo by Hello I'm Nik on Unsplash

Table of contents

I was rear-ended a few months ago, luckily no one was hurt. However, the car was totaled and it was time to search for a vehicle in a tough car market. There was very limited inventory everywhere due to COVID and folks were flush with cash. High demand and low supply.

I was scouring my local Toyota websites daily until I built the following solution to automatically scrape the listings and productionize the script with GitHub Actions.

Goal

  • Scrape my local Toyota website for all RAV4 listings.

  • Send myself the prices of each car via SMS text message, sorted by lowest price to highest.

Purpose

  • Monitor the inventory and fluctuating prices; allowing me to jump on a deposit for a car.

Python Procedure

Identifying HTML Values

  • First, I needed to find the HTML values I was after on my Toyota dealer's website.

  • I inspected the MSRP value on the inventory page and found

    • <div class = "price_value"> $34,889

Requests and Beautiful Soup

Easy enough, the start of the script:

  • Sends a basic get request

  • Creates a Beautiful Soup object

  • Grabs all div elements with the class name of price_value

  • De-duplicate the returned items using the set() data structure

def get_bike_items(url):
    #Use the requests library for a simple get request
    response = requests.get(url)

    #Build the bs4 soup object
    html_soup = BeautifulSoup(response.text, 'html.parser')

    #Find all divs with a name of 
    all_cars = html_soup.find_all('div', class_ = 'price_value')
    all_cars = set(all_cars)

Some light cleaning is needed for the returned strings

  • Loop through all cars

  • Replace new lines and strip white space

  • Append back to a new list

  • Sort list

  • Return the list

Light Cleaning

    cars_text = []
    for cars in all_cars:
        text = cars.text
        care_c = text.replace("\n","").strip()
        cars_text.append(care_c)

    cars = sorted(cars_text)
    return cars

Constructing String Message

I had two URLs to pass into this function, one for Hybrid and one for Regular gasoline RAV4s but I wanted each page to be sent in one text message

  • Loop over array of URLs

  • The first URL in the list was for Hybrid RAV4s so I added REG to the end of the first item in the array (index 0) and started sms_text with 'HYBRIDS || '

  • Join the returned list of strings into one string, separated by ||

    • '||'.join(get_bike_items(url))
urls = ['https://www.sheehytoyotafredericksburg.com/new-toyota-rav4-hybrid-fredericksburg-va',
'https://www.sheehytoyotafredericksburg.com/new-toyota-rav4-fredericksburg-va']

sms_text = 'HYBRIDs || '

for index, url in enumerate(urls):
    if index ==0:
        sms_text += '||'.join(get_bike_items(url)) +'\nREG ||'
    else:
        sms_text += '||'.join(get_bike_items(url))

#Calling the function below to send the SMS 
send(sms_text)

SMS Message

Lastly, I just needed to send the SMS message!

  • Below is the function for sending a SMS message. It works by using an email account to send the message to a phone carrier network
import smtplib
carriers = {
    'att':    '@mms.att.net',
    'tmobile':' @tmomail.net',
    'verizon':  '@vtext.com',
    'sprint':   '@page.nextel.com'
}

def send(message):
        # Replace the number with your own, or consider using an argument\dict for multiple people.
    to_number = 'xxxxxxxxxx{}'.format(carriers['xxxxx'])
    auth = ('[email protected]', 'xxxpass')

    # Establish a secure session with gmail's outgoing SMTP server using your gmail account
    server = smtplib.SMTP( "smtp.gmail.com", 587 )
    server.starttls()
    server.login(auth[0], auth[1])

    # Send text message through SMS gateway of destination number
    server.sendmail( auth[0], to_number, message)

GitHub Actions Automation

After the script was running, I wanted to be able to send these messages to myself automatically twice a day.

GitHub actions performs very well for this type of use case. It's essentially a serverless framework for executing code. I plan to do another article that goes deeper into Actions.

For now, to get the above script running:

  • Push code to a private GitHub repository

  • Create a .yml file in your repository with the path of .github/workflows/main.yml

The structure of the YAML is fairly straightforward

GitHub Action YAML File

#Name of the Action
name: car_scrape_sms

#On is the trigger of when this will be executed
on: 
#Here I am using a basic cron schedule 
  schedule:
    - cron: '15 14 * * *'
    - cron: '15 2 * * *'

jobs:
  upload:
    #The execution environment of the runner 
    runs-on: ubuntu-latest
    steps:
      # Checking the repository out to the execution env 
      - uses: actions/checkout@v3
      - name: Set up Python 
        # Installs Python on the env 
        uses: actions/setup-python@v3
        with:
          python-version: '3.10'
      - name: Install dependencies
        #CLI arguments to execute on the runner 
        run: |
          pip install requests
          pip install beautifulsoup4
      - name: run main
        run: |
          python main.py

GitHub Action Keywords Explained

  • name: is the name of your Action run

  • on: is the keyword to trigger your workflow, here I am using a cron schedule

  • jobs: starts the main entry into the workflow

    • runs-on: is the platform OS, essentially the container (runner) environment that your job will run on

    • steps: are sections to categorically separate pieces of your Action

      • name: of your step

      • uses: can call other actions

        • Here I am using another action that checkouts my repository to the container environment that this will be executed on. Essentially it copies all of the scripts in the repo to the execution env.

        • I am also setting up python in the container env with actions/setup-python@v3

          • with: is passing a parameter to specify the version of python from that above action

      • run: here we can specify the commands to run on the runner. You can treat this as the command line of the runner.

This barely scratches the surface of the power of GitHub Actions!!

Action Run Example

Below is an example of an Action run for the above scripts.

Output

Finally here is the output that gets sent to my phone

serverlessPythongithub-actions