age.py

#! /usr/bin/env python3
""" Calcula los días transcurridos desde una fecha.
"""

import datetime

DAY_LABELS = "Lunes,Martes,Miércoles,Jueves,Viernes,Sábado,Domingo".split(',')

user_date = input('Fecha> ')
day, month, year = [int(s) for s in user_date.split('-')]

date = datetime.date(year, month, day)
today = datetime.date.today()

print('Fue: %s' % DAY_LABELS[date.weekday()])

diff = today - date

diff_years, diff_days = divmod(diff.days, 365)
diff_months, diff_days = divmod(diff_days, 30)

tpl = '%s años, %s meses y %s días'
data = diff_years, diff_months, diff_days
print(tpl % data)