text: Title: Question on Web Scraper
  Body: Hello there I hope all is well.
  
  Thank you so much for:
  
  https://github.com/tattooday/web-scraping/blob/master/CME2.py
  
  Its helping a lot, as I am basically looking for a python scraper to scrape futures prices. Just one question for you.
  
  In your code, you designate code numbers for silver gold palladium and copper to be:
  
  458, 437, 445, and 438
  
  I am curious where I would go to find these sequence matchups? Along with find more alternatives and associated codes so I can scrape them too, such as wheat, oil, gold, etc....
  
  Basically where do I go on the web to see what how silver is linked to 458 for example , and gold is linked to 437. And also find codes for other commodities. 
  
  I really appreciate your help in advance and hope to speak soon!
  
  
  Best,
  
  Sam 