I have a string variable with the exact name of a function, e.g.

```
ran_test_opt = "random_aoi"

```

The function looks like this:

```
def random_aoi():
  logging.info("Random AOI Test").

```

The string is received from a config file and therefore can't be changed. Is there a way I can convert the string into an actual function call so that

```
ran_test_opt()

```

would run the `random_aoi` function?