如何将字符串格式的多维数组解析回多维数组

def parse_string_array(string_array):
    # Step 1: Split the string by delimiter
    elements = string_array.split(',')

    # Step 2: Determine the dimensions and sizes of the multi-dimensional array
    dimensions = []
    size = len(elements)
    while size > 0:
        dimensions.append(size)
        size //= 2

    # Step 3: Initialize the multi-dimensional array
    multi_array = create_multi_array(dimensions)

    # Step 4: Assign values to the multi-dimensional array
    assign_values(multi_array, elements)

    return multi_array

def create_multi_array(dimensions):
    if len(dimensions) == 1:
        return [None] * dimensions[0]
    else:
        return [create_multi_array(dimensions[1:]) for _ in range(dimensions[0])]

def assign_values(multi_array, elements):
    if isinstance(multi_array, list):
        for i, element in enumerate(elements):
            multi_array[i] = assign_values(multi_array[i], element)
    else:
        return elements

# Example usage
string_array = "1,2,3;4,5,6;7,8,9"
multi_array = parse_string_array(string_array)
print(multi_array)