isaacs/yamlish — pull request #5 by rmg (2014-04-17 05:12:10+00:00)
Title: Use block string as cheap string escape

Strings like '[Date 01:23:45] foo' cannot be bare strings in YAML, but that is exactly the kind of thing you get if stderr consists of a single, timestamped line.

see: http://pyyaml.org/wiki/YAMLColonInFlowContext