我想看看裝飾器的裝飾函數的字節碼。如何查看裝飾函數的字節碼?
例如在下面的例子中,fibonacci是通過memoized裝飾的。但是,當我在斐波那契上調用「dis.dis」時,它會顯示實際函數的字節碼。
我希望能夠看到一個函數是否已經裝飾並看到包含裝飾部分的字節碼。
我完全誤解了一些概念嗎?
import collections
import functools
class memoized(object):
'''Decorator. Caches a function's return value each time it is called.
If called later with the same arguments, the cached value is returned
(not reevaluated).
'''
def __init__(self, func):
self.func = func
self.cache = {}
def __call__(self, *args):
if not isinstance(args, collections.Hashable):
# uncacheable. a list, for instance.
# better to not cache than blow up.
return self.func(*args)
if args in self.cache:
print 'get cached version{}'.format(args)
return self.cache[args]
else:
print 'compute {}'.format(args)
value = self.func(*args)
self.cache[args] = value
return value
def __repr__(self):
'''Return the function's docstring.'''
return self.func.__doc__
def __get__(self, obj, objtype):
'''Support instance methods.'''
return functools.partial(self.__call__, obj)
@memoized
def fibonacci(n):
"Return the nth fibonacci number."
if n in (0, 1):
return n
return fibonacci(n-1) + fibonacci(n-2)
print fibonacci(12)
import dis
f = fibonacci
dis.dis(f)