from typing import Any


def arg_dict_creator(string: Any):
    """Creates a Dict from a CSV string.

    Args:
        string(str): CSV string - formatted as 'field1:value1,field2:value2'.

    Returns:
        Dict from string representation.
    """
    if not string:
        return None

    split_string = string.split(',')
    arg_dict = {}
    for section in split_string:
        section_key, section_value = section.split(':', 1)
        arg_dict[section_key] = section_value

    return arg_dict