Hello,

I am trying to understand the source code.  My reading is, that
interfaces/subscriptions.py:class ISubscriptionManager.register always
returns a 3-tuple and the last element of the tuple is a member object,
or None.   This coincides with the implementation in
app/subscriptions.py.SubscriptionManager.register .
cli_synmembers.py:add_members() contains:

    member = registrar.register(
        subscriber,
        pre_verified=True,
        pre_approved=True,
        pre_confirmed=True,
        send_welcome_message=welcome_msg)[2]
    member.preferences.delivery_status = delivery_status
    member.preferences.delivery_mode = delivery_mode
    return

and commands/cli_addmembers.py:add_members() contains

    member = registrar.register(
        subscriber,
        pre_verified=True,
        pre_approved=True,
        pre_confirmed=True,
        invitation=invite,
        send_welcome_message=welcome_msg)[2]
    if member is not None:
        member.preferences.delivery_status = delivery_status
        member.preferences.delivery_mode = delivery_mode
    return

So my question is: when regirstar.register returns a tuple, the last
argument of which is a members, why do the above snippets store the
result in a variable called `member`?

How are the set preferences set to member handled further, as my
reading is that the variable just disappears, immediately after
member.preferences is set?

Greeting
  Дилян
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