Parallel Python: What is a callback?

Question

In Parallel Python it has something in the submit function called a callback (documentation) however it doesn\'t seem to explain it too well. I\'ve posted on

Answer 1

A callback is simply a function. In Python, functions are just more objects, and so the name of a function can be used as a variable, like so:

def func():
    ...

something(func)

Note that many functions which accept a callback as an argument usually require that the callback accept certain arguments. In this case, the callback function will need to accept a list of arguments specified in callbackargs. I'm not familiar with Parallel Python so I don't know exactly what it wants.