test.py

import time

start_time = int(time.time())

def time_from_boot():
    """Return time from boot in
    years, months, days, hours, minutes, seconds"""
    seconds = int(time.time()) - start_time
    minutes, seconds = divmod(seconds, 60)
    hours, minutes = divmod(minutes, 60)
    days, hours = divmod(hours, 24)
    months, days = divmod(days, 30)
    years, months = divmod(months, 12)

    time_elapsed = ''

    if years >0:
        time_elapsed += str(years) + (years == 1 and ' Year' or ' Years') + ', '
    if months > 0:
        time_elapsed += str(months) + (months == 1 and ' Month' or ' Months') + ', '
    if days > 0:
        time_elapsed += str(days) + (days == 1 and ' Day' or ' Days') + ', '
    if hours > 0:
        time_elapsed += str(hours) + (hours == 1 and ' Hour' or ' Hours') + ', '
    if minutes > 0:
        time_elapsed += str(minutes) + (minutes == 1 and ' Minute' or ' Minutes') + ', '
    if seconds >0:
        time_elapsed += str(seconds) + (seconds == 1 and ' Second' or ' Seconds')

    return time_elapsed

while True:
    print(time_from_boot())