python 闭包特性

def outer(arg1):
    print ‘im outer and ‘ + arg1
    def middle(arg2):
        print ‘im middle‘
        def inner(func):
            print ‘im inner‘
            return func(arg2)
        return inner
    return middle

print outer(‘kokok‘)(123)(lambda x: x)

f_middle = outer(‘kokok‘)  # return middle
f_inner = f_middle(123)  # return inner
func_result = f_inner(lambda x: x)  # return the result of func(arg2)
print func_result

im outer and kokok
im middle
im inner
123