'How to query if function is deprecated

I have some functions like

@deprecated(reason="foo is deprecated")
def foo():
    pass

def bar():
    pass

if use_cpp_library:
    foo = get_cpp_lib_implementation(foo)
    bar = get_cpp_lib_implementation(bar)

The problem I have is that this foo "forgets" the @deprecrated decorator here when being replaced by a C++ binding. Can it (decorators) be programmatically queried for existence? And if yes, then query the reason?

python

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'How to query if function is deprecated

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