Python: Signature

Yao Yao on September 29, 2016

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):

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.

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