How to create a new list or set object for an inner dictionary key so that the same object is not re-CodePudding

I'm trying to create an inner dictionary that has values stored in a list or set object (using a set for this example).

t = [('Jobs', set()), ('Titles', set())]
inn_d = lambda: dict(t)

And creating a default dictionary and passing inn_d into that.

d = defaultdict(inn_d)

When creating the entries for d and the outer keys, both values for each inner key gets updated.

d['A']['Jobs'].add('Cook')
d['B']['Titles'].add('President')
d
defaultdict(<function <lambda> at 0x0000016691157DC0>, {'A': {'Jobs': {'Cook'}, 'Titles': {'President'}}, 'B': {'Jobs': {'Cook'}, 'Titles': {'President'}}})

When it should be

defaultdict(<function <lambda> at 0x0000016691157DC0>, {'A': {'Jobs': {'Cook'}, 'Titles': set()}, 'B': {'Jobs': set(), 'Titles': {'President'}}})

I know that the same set object for both Jobs and Titles is getting called - I am not sure how to create a new set object when creating the inner dictionary.

Thank you for your help.

CodePudding user response：

Create a new one each time like this:

def inn_d():
    return {'Jobs': set(), 'Titles': set()}

By the way, named lambdas are bad practice.