alarm_clock.py v1.1

# alarm_clock.py

from time import ctime, clock, sleep
import winsound
import sys
import msvcrt

def get_num_tadas_from_user():
    while True:
        n = input("\nHow many taDAHs?> ")
        if n == '':
            return 1
        else:
            try:
                n = int(n)
                return n
            except ValueError:
                continue

def get_message_from_user():
    """
    The message is printed when the alarm rings.
    The idea is that the message will tell the user the reason
    for the alarm. Examples are, "Feed the cat", "Go to bed", "Write to Nick".
    """
    print("""
    Enter a message about what the alarm ringing means,
    in case you forget, or have several alarms set.
    Enter nothing if no message.
    """)
    message = input("\nMessage?> ")
    if message == '':
        print("no message entered")
        return None
    else:
        return message

def get_alarm_time_from_user(num_tadas, message):
    while True:
        print("""
        Enter an alarm time in 24-hour time.
        Both hours and minutes should be in 2 digits, separated by a colon.
        13:00, 22:45, 02:30, 00:05
        Military time will be converted to 24-hour time
        1300 -> 13:00, 0005 -> 00:05
        """)

        alarm_time = input("alarm time?> ")
        if ':' not in alarm_time:
            if len(alarm_time) == 4:
                alarm_time = alarm_time[:2] + ':' + alarm_time[2:]
            else:
                continue
        alarm_time_list = alarm_time.split(':')
        hour = alarm_time_list[0]
        if len(hour) != 2 or hour[0] not in '012' or hour[1] not in '0123456789':
            continue
        minute = alarm_time_list[1]
        if len(minute) != 2 or minute[0] not in '012345' or minute[1] not in '0123456789':
            continue
        print("\nIs", alarm_time, today_or_tomorrow(alarm_time), "the time you want?")
        print("Hit enter for 'yes'; enter any character for 'no'")
        ans = input("\nanswer?> ")
        if ans == '':
            return alarm_time
        else:
            continue

def today_or_tomorrow(alarm_time):
    now = ctime()[11:16]
    if time2seconds(now) > time2seconds(alarm_time):
        return "tomorrow"
    else:
        return "today"

def tada_or_tadas(num_tadas):
    """
    Make "tada" plural when appropriate.

    "tada" is one of the sounds that come with Windows: taDAH.
    """
    if num_tadas == 1:
        return "taDAH"
    else:
        return "taDAHs"

def time2seconds(time):
    """
    Given 24-hour time as string, return seconds as int.
    """
    time = time.replace(':', '')
    hour_string = time[:2]
    minute_string = time[2:]
    if hour_string[0] == '0':
        hour = int(hour_string[1])
    else:
        hour = int(hour_string)

    if minute_string[0] == '0':
        minute = int(minute_string[1])
    else:
        minute = int(minute_string)
    return 3600*hour + 60*minute

def display_current_time():
    """
    Prints the current time as 24-hour time -- but no seconds.
    13:07, 05:00, 23:59, 00:02, etc.
    Each printing overwrites the previous one.
    """
    sys.stdout.flush()
    print("The time now is", ctime()[11:16], "\r", end='')

def print_summary(alarm_time, today_tomorrow, num_tadas, message):
    print("\nThe alarm is set to ring at", alarm_time, today_tomorrow)
    if message:
        print(" with ", num_tadas, " ", tada_or_tadas(num_tadas), " and message, '", message, "'", sep='')
    else:
        print("with", num_tadas, tada_or_tadas(num_tadas), "and no message.")

def ring_alarm_when_present_time_equals_alarm_time(alarm_time, num_tadas):
    print()
    while alarm_time != ctime()[11:16]:
        sleep(0.1)
        display_current_time()
    for tada in range(0, num_tadas):
        winsound.PlaySound("/P31Working/Sounds/TaDa", winsound.SND_ALIAS)

def main():
    print("\n" * 9)
    num_tadas = get_num_tadas_from_user()
    message = get_message_from_user()
    alarm_time = get_alarm_time_from_user(num_tadas, message)
    today_tomorrow = today_or_tomorrow(alarm_time)
    print_summary(alarm_time, today_tomorrow, num_tadas, message)
    ring_alarm_when_present_time_equals_alarm_time(alarm_time, num_tadas)
    if message:
        print("\nmessage:", message, "\n")
    print()
    print("Hit Enter to close Alarm Clock")
    input()


if __name__ == '__main__':
    main()