Используйте map и reduce, чтобы посчитать площадь квартиры

from functools import reduce
 
rooms = [
    {"name": "кухня", "length": 6, "width": 4},
    {"name": "комната 1", "length": 5.5, "width": 4.5},
    {"name": "комната 2", "length": 5, "width": 4},
    {"name": "комната 3", "length": 7, "width": 6.3},
]
 
rooms = map()
square = reduce()

from functools import reduce
 
rooms = [
    {"name": "кухня", "length": 6, "width": 4},
    {"name": "комната 1", "length": 5.5, "width": 4.5},
    {"name": "комната 2", "length": 5, "width": 4},
    {"name": "комната 3", "length": 7, "width": 6.3},
]
 
 
def rooms_sqr(x):
    x["room square"] = x["length"] * x["width"]
    return x
 
def union(a, b):
    return a["room square"] + b["room square"]
 
 
rooms = list(map(rooms_sqr, rooms))
 
square = list(reduce(union, rooms))

from operator import __add__
from functools import reduce
#==============================================================================
rooms = [
    {"name": "кухня", "length": 6, "width": 4},
    {"name": "комната 1", "length": 5.5, "width": 4.5},
    {"name": "комната 2", "length": 5, "width": 4},
    {"name": "комната 3", "length": 7, "width": 6.3},
]
print( reduce( __add__, list( map( lambda x: x['length']*x['width'], rooms ) ) ) )

from functools import reduce
#==============================================================================
def rooms_sqr(x):
    return x["length"] * x["width"]
#==============================================================================
def union(a, b):
    return a + b
#==============================================================================
rooms = [
    {"name": "кухня", "length": 6, "width": 4},
    {"name": "комната 1", "length": 5.5, "width": 4.5},
    {"name": "комната 2", "length": 5, "width": 4},
    {"name": "комната 3", "length": 7, "width": 6.3},
]
print( reduce( union, list( map( rooms_sqr, rooms ) ) ) )