traitlets.warn is private, use warnings.warn #6842
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As pointed out by @blink1073 in jupyterhub/jupyterhub#4418
traitlets.warn
is private. The signature of thetraitlets.warn
method changed in ipython/traitlets#838 which means notebook 6.* will break when traitlets is next released.This switches to the standard
warnings.warn
instead.