pre-PEP: Simple Thunks

[Ron]

Mike Meyer wrote:
> Ron_Adam <radam2_ at _tampabay.rr.com> writes:
> 
>>Here's yet another way to do it, but it has some limitations as well.
>>
>>import pickle
>>def pickle_it(filename, obj, commands):
>>    try:
>>        f = open(filename, 'r')    
>>        obj = pickle.load(f)
>>        f.close()
>>    except IOError:
>>        pass 	
>>    for i in commands:
>>        i[0](i[1])
>>    f = open(filename, 'w')
>>    pickle.dump(obj, f)
>>    f.close()
>> 
>>file = 'filename'
>>L = []
>>
>>opps = [ (L.append,'more data'),
>>         (L.append,'even more data') ]
>>pickle_it(file, L, opps)
> 
> 
> Um - it doesn't look like this will work. You pass L in as the "obj"
> paremeter, and then it gets changed to the results of a
> pickle.load. However, you call L.append in the for loop, so the data
> will be appended to L, not obj. You'll lose an list elements that were
> in the pickle.
> 
>    <mike

Hmmm, you are correct. :-/

I was trying to not use eval().  This could be made to work, but it will 
get messy, which is another reason not to do it.

Cheers,
Ron