def get_mod_func(callback):
    try:
        dot = callback.rindex('.')
    except ValueError:
        return (callback, '')
    return (callback[:dot], callback[dot+1:])
Converts `var_name` to `varName` style.
dataset/ETHPy150Open nigelkersten/pymacadmin/bin/crankd.py/get_mod_func--crossover with--dataset/ETHPy150Open sutar/JSON2Mantle/JSON2Mantle/cli.py/JSON2Mantle._convert_name_style