示例:
class MyClass:
@property
def read_only(self): return None
def __write_only_setter(self, value): pass
write_only = property(None, __write_only_setter)
a = MyClass()
a.read_only = 10 # 无法设置属性
del a.read_only # 无法删除属性
print(a.write_only) # 无法读取属性