The snippet does not fail for me. It is possible that python3 might be the culprit, but I have my doubts about this. If you have access to both python2 and 3 inside of vim you can try forcing it to be used: https://github.com/SirVer/ultisnips/blob/master/doc/UltiSnips.txt#L108
From where did you install the plugin and which version are you using? If you have it from github, which fork did you clone?
The snippet does not fail for me. It is possible that python3 might be the culprit, but I have my doubts about this. If you have access to both python2 and 3 inside of vim you can try forcing it to be used: https:/ /github. com/SirVer/ ultisnips/ blob/master/ doc/UltiSnips. txt#L108
From where did you install the plugin and which version are you using? If you have it from github, which fork did you clone?