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trait_medatada exception #37

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trait_medatada exception #37

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9 changes: 6 additions & 3 deletions traitlets/traitlets.py
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Original file line number Diff line number Diff line change
Expand Up @@ -841,13 +841,16 @@ def traits(self, **metadata):

return result

def trait_metadata(self, traitname, key, default=None):
def trait_metadata(self, traitname, key, default=None, allow_raise=True):
"""Get metadata values for trait by key."""
try:
trait = getattr(self.__class__, traitname)
except AttributeError:
raise TraitError("Class %s does not have a trait named %s" %
(self.__class__.__name__, traitname))
if allow_raise:
raise TraitError("Class %s does not have a trait named %s" %
(self.__class__.__name__, traitname))
else:
return default
else:
return trait.get_metadata(key, default)

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