What is the difference between Cron and Celery?

Question

Task Schedulers

Hello!

Could someone explain briefly and clearly how Cron differs from Celery?

Answer 1

cron is a "function" of linux systems to run scheduled tasks. Most "primitive". Told her to "pull [filename].py [every day at 6]/[every 15 minutes]" (conditionally), she would do it.
celery is a python library that allows you to:

• do the same, but directly in the code (which allows you to abstract from the OS).
  
• Add "tasks" to the task queue, which allows code to be executed without waiting for any process to terminate.
  

Why is the second necessary? For example, to download large files. If you do a view in the main body, then there is a great chance to catch a timeout error. Therefore, the main data is stored in the main body, and the file is loaded in a separate task.
Also, it can be used to work with external services, such as mail. Here the situation is about the same as with files: if you want to send an email, but the server does not respond for a long time - catch the timeout.