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Incrementing integer using variable name string

Its never a good idea to eval or exec code, 99 times out of 100 there is a better way to do it. In this case unless you have any other reason that really needs to use eval and exec you could achieve what your trying with a dict. it can hold a key ("name") used to reference or look up your value quite safely.

class MyClass:

    def __init__(self):

        self.my_counts = {

            'rhce': 0,

            'rhcsa': 0

        }

    def add_cert_user(self, userid, args):

        print("start of function", self.my_counts)

        for cert in args:

            if cert  in self.my_counts:

                self.my_counts[cert] += 1

        print("end of function", self.my_counts)

me = MyClass()

args = ['rhce','rhcsa']

me.add_cert_user("test", args)

me.add_cert_user("test", args)

me.add_cert_user("test", args)

OUTPUT

start of function {'rhce': 0, 'rhcsa': 0}

end of function {'rhce': 1, 'rhcsa': 1}

start of function {'rhce': 1, 'rhcsa': 1}

end of function {'rhce': 2, 'rhcsa': 2}

start of function {'rhce': 2, 'rhcsa': 2}

end of function {'rhce': 3, 'rhcsa': 3}