match = next(x for x in db_data if x["PropertyId"] == parsed_incoming_data["PropertyId"])

Breaking it down:

• next() returns the first value of an iterator. In subsequent calls, it would return the following item.
• next requires an iterator. An iterator yields number of objects on the fly. This is different from a list which contains and stores values. Lists and tuples can be converted to iterators with the iter() method.
• In my example above, the list comprehension x for x in db_data above yields an iterator, covering our type requirement for next.
• We're filtering by matching another value: if x['PropertyId'] == parsed_incoming_data['propertyId]

Voilà! Filtering for a match in one line.