Python: Signature

Just a reminder that we have such objects to inspect the function signatures， as PEP 362 – Function Signature Object indicates.

Here is an example from The Python Standard Library – 29.12.3. Introspecting callables with the Signature object.

from inspect import signature

def foo(a, *, b:int, **kwargs):
    pass

sig = signature(foo)

print(str(sig))  # (a, *, b:int, **kwargs)
print(str(sig.parameters['b']))  # b:int
print(sig.parameters['b'].annotation)  # <class 'int'>

I can smell something like Java reflection.