我可以使用具有 class 属性/function 的变量吗？

Question

It doesn't allow me to use a variable with an attribute of the class. Not sure how to manage this. I need the answer to come out as 7. But I need to be able to use the variable for it. gives me the error,

Traceback (most recent call last): File "c:/Data/First Game (Python)/rough.py", line 32, in a.add_2(5) AttributeError: 'str' object has no attribute 'x'

I think it is not able to recognize that by a I meant to mention Me1.

class Test():
    def add_2(self, y):
        print(y + 2)

Me1 = Test()

for i in range (1):
    a = "Me" + str(i+1)
    print (a)
    a.add_2(5)

Answer 1

From what I see the variable a is a string while the function a.add_2(5) belongs to the objects of class Test . The error is caused by the fact that you call a method of class Test on a string

Answer 2

It doesn't make any sense on constructing an object of a class at runtime unless you're exploring something to learn. But, here is what you're looking for,

class Test():
    def add_2(self, y):
        print(y + 2)

Me1 = Test()

for i in range (1):
    a = "Me" + str(i+1)
    print(a)
    b = eval(a) # converting str to Class Test object
    b.add_2(5)

Output:

Me1
7

Reference: https://docs.python.org/3/library/functions.html#eval