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use traitlets-4.1 observe/default decorators
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@@ -128,7 +128,7 @@ class Spawner(LoggingConfigurable):
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cmd = Command(['jupyterhub-singleuser'],
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help="""The command used for starting notebooks."""
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).tag(config=True)
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args = List(Unicode,
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args = List(Unicode(),
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help="""Extra arguments to be passed to the single-user server"""
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).tag(config=True)
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