str_to_attr.py

class Foo():
    def __init__(self):
        self.foo1 = 1
        self.foo2 = 2
        self.foo3 = 3
        self.foo4 = 4
        self.foo5 = 5

        self.str_to_attr = {
            'foo1 string': 'foo1',
            'foo2 string': 'foo2',
            'foo3 string': 'foo3',
            'foo4 string': 'foo4',
            'foo5 string': 'foo5',
        }

    def get_value(self, attr_str) -> None:
        attr_name = self.str_to_attr.get(attr_str, None)
        if attr_name is None:
            raise ValueError
        val = self.__getattribute__(attr_name)
        return val

    def set_value(self, attr_str, val) -> None:
        attr_name = self.str_to_attr.get(attr_str, None)
        if attr_name is None:
            raise ValueError
        self.__setattr__(attr_name, val)


foo = Foo()
print(foo.get_value('foo1 string'))
foo.set_value('foo2 string', 11)
foo.set_value('foo3 string', 12)

print('set')
print(foo.get_value('foo1 string'))
print(foo.get_value('foo2 string'))
print(foo.get_value('foo3 string'))