My solution to challenge

def_dict = defaultdict(lambda: {"value": "", "isIncreased": False, "isDecreased": False})
my_dict = defaultdict(lambda: def_dict)
# PyCharm raises warning for two lines below, but it works
my_dict['current_half_over_under'] = defaultdict(lambda: def_dict)
my_dict['full_time_over_under'] = defaultdict(lambda: def_dict)
# And to set "handicap" keys in "full_time_over_under" and "current_half_over_under" dictionaries we should access it via
# my_dict.setdefault('handicap', some_value)