Removed debug-prints

def mergesort(array):

    debug_print(array=array)

    if len(array) <= 1:

        return array

    m = len(array) // 2

    debug_print(m=m)

    left = mergesort(array[:m])

    right = mergesort(array[m:])

def merge(left, right):

    debug_print(debug_msg="Merging...", left=left, right=right)

    merged = []

    while len(left) > 0 and len(right) > 0:

    else:

        merged += right

    debug_print(merged=merged)

    return merged

if __name__ == "__main__":

    input_str = input("Enter numbers, separated by ',': ")

    input_list = input_str.split(",")

    debug_print(input_list=input_list)

    value_list = []

    for x in input_list:

        try:

            print("Invalid input.")

            quit(1)

    debug_print(value_list=value_list)

    sorted_list = mergesort(value_list)

    print(sorted_list)