通过指向此函数的指针获取函数参数值?

Church pair

cons(3, 4) f f(3, 4) 3

def car(pair):
    def firstarg(x, y):
        return x
    return pair(firstarg)

car(cons(3, 4)) cons(3, 4)(firstarg) firstarg(3, 4)

def someMethod(self, arg1, kwarg1=None):
    pass

sig = signature(someMethod)

str(sig)  # returns: '(self, arg1, kwarg1=None)'

params = sig.parameters 
print(params['kwarg1']) # prints: kwarg1=20

print(len(params))  # 3

kwarg1 = params['kwarg1']
kwarg1.default # returns: None

def foo(a=3, b=4):
    return 'test'

if __name__ == '__main__':
    p = foo         # pointer to function
    print(type(p))  # function
    print(p.__defaults__)  # Returns (3, 4)
    # local_a = p.a       or p[0]
    # local_b = p.b       or p[1]