wrapper

from inspect import getcallargs

def show_var_info(var):
    print getcallargs(show_var_info, var)


def wrapper(f, *args, **kwargs):
    def inner(*args, **kwargs):
        print getcallargs(f, *args, **kwargs)
        return f(*args, **kwargs)
    return inner

@wrapper
def foo(a):
    print a * a
    return a * a

@wrapper
def bar(a, b):
    print a + b
    return a + b

if __name__ == "__main__":
    foo(3)
    bar(1, 2)

### 输出
{'a': 3}
9
{'a': 1, 'b': 2}
3