Python: obtiene la fecha de esta semana.

import datetime
from datetime import timedelta


def get_current_week():
    fmt = lambda x: datetime.datetime.strftime(x, "%Y-%m-%d")
    today = datetime.date.today()
    monday = today - timedelta(days=today.weekday())
    return [fmt(monday + timedelta(days=i)) for i in range(7)]

print(get_current_week())