def _filter_estate(estate: Any) -> bool:
"""
Checks whether estate's viable or not.
:param estate: target entity to be checked
:return: is estate correctly parsed
"""
return (notnull(estate) and notnull(estate.price)
and notnull(estate.area))
def _filter_offer(offer: Any) -> bool:
"""
Checks whether offer's markup is None or not.
:param offer: target entity to be checked
:return: is offer's markup None or not
"""
return notnull(offer['markup'])
def _filter_price(estate: Any) -> bool:
"""
Checks whether estate's price is None or not.
:param estate: target entity to be checked
:return: is estate's price None or not
"""
return notnull(estate.price)
def _filter_geolocation(estate: Any) -> bool:
"""
Checks whether estate's location is None or not.
:param estate: target entity to be checked
:return: is estate's geolocation None or not
"""
return notnull(estate.geolocation)
def _validate(self, struct: Any) -> bool:
"""
The most basic inspection, which implies nullability check.
:param struct: target object
:return: whether object is valid or not
"""
return notnull(struct)
def test_notnull():
assert notnull({})
assert notnull(0)
assert not notnull(None)