>>> def f1(x):

return x*2

>>> def new_fn(f):

def fn(x):

print('call'+f._name_+'()')

return f(x)

return fn

>>> f1=new_fn(f1)

>>> print(f1(5))

Traceback (most recent call last):

  File "<pyshell#10>", line 1, in <module>

    print(f1(5))

  File "<pyshell#8>", line 3, in fn

    print('call'+f._name_+'()')

AttributeError: 'function' object has no attribute '_name_'