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Solution

With this maze structure:

In [1]:
house = {
    'living' : {
        'exits': {
            'north' : 'kitchen',
            'outside' : 'garden',
            'upstairs' : 'bedroom'
        },
        'people' : ['James'],
        'capacity' : 2
    },
    'kitchen' : {
        'exits': {
            'south' : 'living'
        },
        'people' : [],
        'capacity' : 1
    },
    'garden' : {
        'exits': {
            'inside' : 'living'
        },
        'people' : ['Sue'],
        'capacity' : 3
    },
    'bedroom' : {
        'exits': {
            'downstairs' : 'living',
            'jump' : 'garden'
        },
        'people' : [],
        'capacity' : 1
    }
}

We can get a simpler dictionary with just capacities like this:

In [2]:
{name: room['capacity'] for name, room in house.items()}
Out[2]:
{'living': 2, 'kitchen': 1, 'garden': 3, 'bedroom': 1}

To get the current number of occupants, we can use a similar dictionary comprehension. Remember that we can filter (only keep certain rooms) by adding an if clause:

In [3]:
{name: len(room['people']) for name, room in house.items() if len(room['people']) > 0}
Out[3]:
{'living': 1, 'garden': 1}