googleads/googleads-python-lib — pull request #19 by mattoc (2014-08-05 06:46:16+00:00)
Title: Fix the action key for the Audience Segment populate example

This is related to #18 as reported by @tly1980

I ran in to the same issue. This patch performs the Populate request correctly (confirmed in the Audience segment's History in the DFP site).