python with object simulating multiple with objects [duplicate]

Question

I want to get this behavior:

with Obj(param=1):
    with Obj(param=2):
        print(...)

using a single object:

with UnifyingObj():
    print(...)

I'm wondering how to safely implement the UnifyingObj class

This has to be a single class. I tried to do something like that:

class _DualWith:
    def __init__(self):
        self._with1 = Obj(param=1)
        self._with2 = Obj(param=2)

    def __enter__(self):
        self._with1.__enter__()
        self._with2.__enter__()

    def __exit__(self, *args, **kwargs):
        self._with2.__exit__(*args, **kwargs)
        self._with1.__exit__(*args, **kwargs)

But I don't think it's fully safe

You need to somehow elaborate your multiple with objects - the same objects, how many? — RomanPerekhrest
– RomanPerekhrest, Commented Oct 2, 2019 at 10:41
It's not a duplicate since I require it to be a single object — user972014
– user972014, Commented Oct 2, 2019 at 10:47

Paul M. · Accepted Answer · 2019-10-02 11:04:51Z

1

Do you NEED to wrap that behavior in a separate class? Maybe you could do something like this?

from contextlib import ExitStack


with ExitStack as stack:
    objects = [stack.enter_context(obj) for obj in [Obj(param=1), Obj(param=2)]]

answered Oct 2, 2019 at 11:04

Paul M.

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