Sort list of objects based on the size of sub-arrays

Question

I have a list of Objects: [variable , variable , variable , ...] which each have an array called domain. As example: variable.domain = ["aa" , "bbb" , "c" , "dddd"]. I need this variable list sorted by the size of the domain arrays. How can i sort this list using .sort() or .sorted() ?

Answer 1

Use a key function

sorted(l, key=lambda x: len(x.domain))

or

l.sort(key=lambda x: len(x.domain))