Directory File Scanner (Including Sub DIRs)

def Scanner(DIR):
    ReturnList = []
    for i in os.scandir(DIR):
        if i.is_file():
            ReturnList.append(i.name)
        elif i.is_dir():
            for x in Scanner(DIR + '/' + i.name):
                ReturnList.append(i.name + '/' + x)

    return ReturnList