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Incrementing integer using variable name string

I'm doing the following in the python interpreter and it works:

rhce=rhcsa=0

args=['rhce,'rhcsa']

for cert in args:

    exec(cert+'+=1')

    print(eval(cert))

>>> 1

>>> 1

As you may see the variable is incremented, whether you use print(rhce) or print(eval(cert)). But, when I put the precise same snippet of code inner a class characteristic, it now does not work. No exceptions are thrown, however, the variable never increments. It's like the exec isn't running:

def addCertUser(self,userid,args):

    rhcsa=rhce=0

    print(args)

    try:

        for cert in args:

            exec(cert+'+=1')

            print(eval(cert))

    except for Exception as e:

        print(e)

>>> ['rhce', 'rhcsa']

>>> 0

>>> 0