def generate(user, courses, selected, destructive) :
grouped = list()
for course in courses :
day, month, year = course.date.split(".")
month = Config.Months[month]
if [month, year] in selected :
if year not in _keys(grouped) :
grouped.append((year, list()))
if month not in _keys(_values(grouped, year)) :
_values(grouped, year).append((month, list()))
_values(_values(grouped, year), month).append(course)
if destructive :
Database.deleteCourse(user.username, course.id)
return storeWithId(user, grouped)
def delete(username, id) : Database.deleteCourse(username, id)