How to set the permission of a folder

bruno

Hi
I’m new to kopano and try to share calendars with everyone.
How do I add a permission? Do I need a keyword?
My code:

#!/usr/bin/env python
import kopano

k = kopano.Server()
store = kopano.user('str').store
cal = store.calendar

print (cal.count)
print(cal.permissions())

# try to share the calendar with everyone. This is not working:
cal.permission.append("everyone", "read_items")

An example in the Reference would be appreciated (https://documentation.kopano.io/kopano_python_kopano/function_reference.html#permission)
Thank you!