from datetime import datetime
def convert(from_dash_to):
    count = -1
    ft = from_dash_to.split('-')
    from_dt = convert_number_to_datetime(ft[0])
    to_dt = convert_number_to_datetime(ft[1])
    print(from_dt)
    print(to_dt)
    if to_dt <= from_dt:
        return
    delta = to_dt - from_dt
    count = round(delta.total_seconds() / 60.0)
    return (convert_datetime_to_iso_format_string(to_dt), count)

convert('200220-200320')

from datetime import datetime
def convert_number_to_datetime(number_string):
    """conver number to datetime
    two number string types are supported, yymmdd and yymmdd.HHMMSS"""
    number_string = str(number_string)
    if len(number_string) == 6:
        return datetime.strptime(number_string, '%y%m%d')
    elif len(number_string) == 13:
        datetime.strptime(number_string, '%y%m%d.%H%M%S')
    else:
        raise ValueError("unsupported number string")

def convert_datetime_to_iso_format_string(datetime):
    """conver datetime iso date format string"""
    ISO_DATEFORMAT = "%Y-%m-%dT%H:%M:%S"
    return datetime.strftime(ISO_DATEFORMAT)

convert_number_to_datetime(201101)
convert_number_to_datetime(122121)
datetime.strptime("20201101", '%y%m%d')

class Tester:
    MAIN_STATEMENT = "아무키나 누르면 다음으로 진행됩니다"

    def __init__(self):
        self.test_list = [
            {
                "preparation": "테스트를 준비하세요.",
                "action": self.print_help,
                "verification": "테스트 결과를 확인하세요.",
            },
            {
                "preparation": "테스트를 준비하세요.",
                "action": self.print_help,
                "verification": "테스트 결과를 확인하세요.",
            },
        ]

    def main(self):
        """main 함수"""

        for test in self.test_list:
            print(test["preparation"])
            input(self.MAIN_STATEMENT)
            test["action"]()
            print(test["verification"])

        print("tests all done")

    def print_help(self):
        print("test print help========================")

if __name__ == "__main__":
    Tester().main()
class Tester:
    MAIN_STATEMENT = "아무키나 누르면 다음으로 진행됩니다"

    def __init__(self):
        self.test_list = [
            {
                "preparation": "테스트를 준비하세요.",
                "action": self.print_help,
                "verification": "테스트 결과를 확인하세요.",
            },
            {
                "preparation": "테스트를 준비하세요.",
                "action": self.print_help,
                "verification": "테스트 결과를 확인하세요.",
            },
        ]

    def main(self):
        """main 함수"""

        for test in self.test_list:
            print(test["preparation"])
            input(self.MAIN_STATEMENT)
            test["action"]()
            print(test["verification"])

        print("tests all done")

    def print_help(self):
        print("test print help========================")

if __name__ == "__main__":
    Tester().main()