/
callable_ext.py
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/
callable_ext.py
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# Copyright 2022 The PyGlove Authors
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""Callable extensions."""
from typing import Any, Callable, List
from pyglove.core.typing import callable_signature
class CallableWithOptionalKeywordArgs:
"""Helper class for invoking callable objects with optional keyword args.
Examples::
f = pg.typing.CallableWithOptionalKeywordArgs(lambda x: x ** 2, 'y')
# Returns 4. Keyword 'y' is ignored.
f(2, y=3)
"""
def __init__(self,
func: Callable[..., Any],
optional_keywords: List[str]):
sig = callable_signature.get_signature(func)
absent_keywords = None
# Check for variable keyword arguments.
if sig.has_varkw:
absent_keywords = []
else:
all_keywords = set(sig.arg_names)
absent_keywords = [k for k in optional_keywords if k not in all_keywords]
self._absent_keywords = absent_keywords
self._func = func
def __call__(self, *args, **kwargs):
"""Delegate the call to function."""
for k in self._absent_keywords:
kwargs.pop(k, None)
return self._func(*args, **kwargs)