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adopt traitlets 4.2 API...
adopt traitlets 4.2 API - `.tag(config=True)` - `@default` - `@observe`

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signatures.py
11 lines | 332 B | text/x-python | PythonLexer
"""Function signature objects for callables.
Use the standard library version if available, as it is more up to date.
Fallback on backport otherwise.
"""
try:
from inspect import BoundArguments, Parameter, Signature, signature
except ImportError:
from ._signatures import BoundArguments, Parameter, Signature, signature