import iatikit
activity_id = 'GB-COH-07676886-3'
activity = iatikit.data().activities.find(id=activity_id, fast=True)
print('IATI publisher "{pub_name}" has an activity with IATI ID: {activity_id}'.format(
pub_name=activity.publisher.name,
activity_id=activity_id))
# IATI publisher "Publish What You Fund" has an activity with IATI ID: GB-COH-07676886-3
E.g.: