api.group.list_members()

[zupo]

Simple, list members of a group.

[witsch]

again, how about:

from plone.api import groups
members = list(groups['guests'])

this feels much more natural than:

members = api.group.list_members('guests')

at least to me… :)

[zupo]

Let's just document how to use the the portal_groups API to list all of its members.

[zupo]

Will be done as part of api.user.get_users(group=group), as discussed in #35.