[Python] Dynamically Added Class Attributes with Getter/Setter Methods in a Loop in Python

I'm trying to dynamically assign class attributes to an existing custom class. These attributes have individual getter and setter methods defined in a loop across all attributes to be created and are assigned with setattr() within the loop. Please see code below.

If I use setattr(), the newly created attributes point towards the last attribute that was created in the list. Whereas if I use setattr() within an eval() statement, it works correctly, i.e. each attribute pointing towards its own value.

I think I kinda understand why - something about the scope of the functions and setattr() in the loop - but I can't really formulate it into words. Can someone smarter than me please give a formal explanation about what is going on and if there is a cleaner solution than using eval()?

for attr in attr_list:
def getter(self):
return getattr(self, attr)

def setter(self, value):
setattr(self, attr, value)

# DOES NOT WORK
setattr(self.__class__, attr, property(getter, setter))

# WORKS
eval(f'setattr(self.__class__, \'{attr}\', property(lambda self: getattr(self, \'{attr}\'), lambda self, value: setattr(self, {attr}, value)))')

Continue reading...