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Description
Please add support for a way to restrict keys on a Dict
...
Example of what should raise a TraitError
from traitlets import HasTraits, Dict, Unicode
class Foo(HasTraits):
# the strict_keys keyword is a suggested feature...
data = Dict(per_key_traits={"this_key": Unicode()}, strict_keys=True)
foo = Foo()
# This is fine...
foo.data = {"this_key": "value"}
# This should raise a TraitError
foo.data = {"invalid_key": None}
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