Question

I want to call a function that takes a class as an argument, without passing it a class.

The function only uses an integer value from the class, and the place I call it from has information that can calculate the value independently.

My code looks like:

Function I want to call:

    def buckets_from_pairs(fs_pairs,par):
        fsea=fermi_sea(par.N)

        # rest of function has no reference to par

Function I call from:

    def deltas(roots):
        if "buckets" in roots:
            # do function on    roots["buckets"]

        if "partition" in roots:
            #somehow define     value  such that  value.N=len(roots["roots"])

            buckets=buckets_from_pairs(roots["partition"], value)

            #do function on    buckets

I could change deltas to take par as an argument and I could change buckets_from_pairs to work without par but both would require a lot of reworking, and I would have to organise it with my supervisor who wrote both functions (he doesn’t have this problem).

So I was hoping there was a simpler way of creating an object that can use the “dot” to reference something than creating a new class in the calling function.

Answer 1

from collections import namedtuple
value = namedtuple('Value', 'N')(len(roots["roots"]))