with open(filename) as f:
    l = [tuple(map(int, line.split(','))) for line in f.readlines()]

def dictpath_is_exists( some_dict, *args ) :
    for key in args :
        if not isinstance(some_dict,dict): 
            return False 
        if not ( key in some_dict ) : 
            return False
        some_dict = some_dict[key]
    return True

def get_value_by_chain(d:dict, chain:list):
    for key in chain:
        _d = d.get(key, None)
        if isinstance(_d, dict):
            d = _d
        else:
            return d