114             return cache[args]

   115 

   116     return f

   117 

   118 def lrucachefunc(func):

   119     '''cache most recent results of function calls'''

   120     cache = {}

   121     order = []

   122     if func.func_code.co_argcount == 1:

   123         def f(arg):

   124             if arg not in cache:

   125                 if len(cache) > 20:

   126                     del cache[order.pop(0)]

   127                 cache[arg] = func(arg)

   128             else:

   129                 order.remove(arg)

   130             order.append(arg)

   131             return cache[arg]

   132     else:

   133         def f(*args):

   134             if args not in cache:

   135                 if len(cache) > 20:

   136                     del cache[order.pop(0)]

   137                 cache[args] = func(*args)

   138             else:

   139                 order.remove(args)

   140             order.append(args)