您可以使用
functools.reduce：
import functoolsdef rsetattr(obj, attr, val): pre, _, post = attr.rpartition('.') return setattr(rgetattr(obj, pre) if pre else obj, post, val)# using wonder's beautiful simplification: https://stackoverflow.com/questions/31174295/getattr-and-setattr-on-nested-objects/31174427?noredirect=1#comment86638618_31174427def rgetattr(obj, attr, *args): def _getattr(obj, attr): return getattr(obj, attr, *args) return functools.reduce(_getattr, [obj] + attr.split('.'))rgetattr并且
rsetattr是插入式替代
getattr和
setattr，这也可以处理点
attr串。
import functoolsclass Person(object): def __init__(self): self.pet = Pet() self.residence = Residence()class Pet(object): def __init__(self,name='Fido',species='Dog'): self.name = name self.species = speciesclass Residence(object): def __init__(self,type='House',sqft=None): self.type = type self.sqft=sqftdef rsetattr(obj, attr, val): pre, _, post = attr.rpartition('.') return setattr(rgetattr(obj, pre) if pre else obj, post, val)def rgetattr(obj, attr, *args): def _getattr(obj, attr): return getattr(obj, attr, *args) return functools.reduce(_getattr, [obj] + attr.split('.'))if __name__=='__main__': p = Person() print(rgetattr(p, 'pet.favorite.color', 'calico')) # 'calico' try: # Without a default argument, `rgetattr`, like `getattr`, raises # AttributeError when the dotted attribute is missing print(rgetattr(p, 'pet.favorite.color')) except AttributeError as err: print(err) # 'Pet' object has no attribute 'favorite' rsetattr(p, 'pet.name', 'Sparky') rsetattr(p, 'residence.type', 'Apartment') print(p.__dict__) print(p.pet.name) # Sparky print(p.residence.type) # Apartment
