{"action":"opened","issue":{"url":"https://api.github.com/repos/igraph/python-igraph/issues/82","repository_url":"https://api.github.com/repos/igraph/python-igraph","labels_url":"https://api.github.com/repos/igraph/python-igraph/issues/82/labels{/name}","comments_url":"https://api.github.com/repos/igraph/python-igraph/issues/82/comments","events_url":"https://api.github.com/repos/igraph/python-igraph/issues/82/events","html_url":"https://github.com/igraph/python-igraph/issues/82","id":158974585,"number":82,"title":"union does not keep attributes","user":{"login":"rokroskar","id":3353586,"avatar_url":"https://avatars.githubusercontent.com/u/3353586?v=3","gravatar_id":"","url":"https://api.github.com/users/rokroskar","html_url":"https://github.com/rokroskar","followers_url":"https://api.github.com/users/rokroskar/followers","following_url":"https://api.github.com/users/rokroskar/following{/other_user}","gists_url":"https://api.github.com/users/rokroskar/gists{/gist_id}","starred_url":"https://api.github.com/users/rokroskar/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/rokroskar/subscriptions","organizations_url":"https://api.github.com/users/rokroskar/orgs","repos_url":"https://api.github.com/users/rokroskar/repos","events_url":"https://api.github.com/users/rokroskar/events{/privacy}","received_events_url":"https://api.github.com/users/rokroskar/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"milestone":null,"comments":0,"created_at":"2016-06-07T17:03:04Z","updated_at":"2016-06-07T17:03:04Z","closed_at":null,"body":"apologies if this is the wrong place for such a question, but: it appears that currently union does not keep attributes? I found an [old thread](http://comments.gmane.org/gmane.comp.science.graph.igraph.general/1541) which seemed to suggest that an option `keep_attributes` would be added, but I can't find such an option anywhere. Is there a different method that should be used instead? "}}
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