def week_start(d):
    d = d - timedelta(d.isoweekday() - 1)
    return datetime(d.year, d.month, d.day, 0, 0, 0)
Determine whether given URL represents an immutable file (i.e. a
dataset/ETHPy150Open mozilla/standup/standup/apps/status/helpers.py/week_start--crossover with--dataset/ETHPy150Open evansd/whitenoise/whitenoise/django.py/DjangoWhiteNoise.is_immutable_file