change objects 'dynamically' in python

Question

I have a number of objects with a similar name format, e.g. max_A, max_B, max_C etc. Given the value of a certain object ID, I'd like to change the value of the object named max_ID (let's say increment by 1, assuming the object already stores an int).

E.g. if ID = 'A' then I'd like to execute max_A += 1, but if ID = 'Q' then I'd like max_Q += 1.

I know I can use eval('max_'+ID) to get the value of max_ID, but how can I change the value?

Answer 1

You can represent the objects like bellow and use endswith function to find the appropriate object to be incremented:

class Data:
    def __init__(self, name, value):
        self.name = name
        self.value = value


max_A = Data("max_A", 1)
max_B = Data("max_B", 2)
max_C = Data("max_C", 3)

obj_list = [max_A, max_B, max_C]


def increment_object_value(ending: str, objects: list):
    for obj in objects:
        if obj.name.endswith(ending):
            obj.value += 1


increment_object_value("A", obj_list)
increment_object_value("B", obj_list)
increment_object_value("C", obj_list)

Answer 2

Using exec:

exec('max_'+ID+' += 1')