meds.py

#!/usr/bin/env python

import datetime as dt
import json
import os


N_PER_BOX = 30

path = os.path.dirname(os.path.realpath(__file__))
with open('%s/truth.json' % path) as f:
    a = json.load(f)
d0 = dt.datetime.strptime(
    next(iter(a['n_remaining_at_date_before_morning_intake'].keys())),
    '%Y-%m-%d'
)
n0 = next(iter(a['n_remaining_at_date_before_morning_intake'].values()))
n_days_since = (dt.datetime.today() - d0).days
n_should_remain = (n0 - n_days_since) % N_PER_BOX or N_PER_BOX
print('%d should remain in box before morning intake' % n_should_remain)