import yaml
class Hero:
    def __init__(self, name, hp, sp):
        self.name = name
        self.hp = hp
        self.sp = sp
    def __repr__(self):
        return "%s(name=%r, hp=%r, sp=%r)" % (
            self.__class__.__name__, self.name, self.hp, self.sp)

STRING = """
!!python/object:__main__.Hero
name: Welthyr Syxgon
hp: 1200
sp: 0
"""

try:
    yaml.load(STRING, Loader=yaml.SafeLoader)
    raise RuntimeError("Didn't raise exception")
except yaml.constructor.ConstructorError:
    pass

print(yaml.unsafe_load(STRING))