title: Where should utility functions live in Django?
body: <p>Where should utility functions live in Django? Functions like custom encrypting/decrypting a number, sending tweets, sending email, verifying object ownership, custom input validation, etc. Repetitive and custom stuff that I use in a number of places in my app. I'm definitely breaking DRY right now.</p>
  
  <p>I saw some demos where functions were defined in models.py, although that didn't seem conceptually right to me. Should they go in a "utilities" app that gets imported into my project? If so, where do they go in the utilities app? The models.py file there?</p>
  
  <p>Thanks for helping this n00b out.</p>
  
  <p><strong>UPDATE:</strong> Let me be even more specific. Say I need a function "light_encrypt(number)" which takes the param "number", multiplies it by 7, adds 10 and returns the result, and another function "light_decrypt(encr_number) which takes the param "encr_number", subtracts 10, divides by 7 and returns the results. Where in my Django tree would I put this? This is not middleware, right? As Felix suggests, do I create a python package and import it into the view where I need these functions?</p>