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Re: Wrote a memoize function: I do not mind feedback

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----- Original Message -----
> From: Peter Otten <__peter__@web.de>
> To: python-list@python.org
> Cc: 
> Sent: Monday, April 27, 2015 4:28 PM
> Subject: Re: Wrote a memoize function: I do not mind feedback
> 
> Cecil Westerhof wrote:
> 
>>  I started again with Python. In Clojure you have memoize. I thought it
>>  nice to have this in Python also. So I wrote it. With a Fibonacci
>>  function to show the usefulness.
>>  You can find it here:
>>     https://github.com/CecilWesterhof/PythonLibrary
>> 
>>  I love to hear what you think of it.
>> 
>>  And ideas for other functionalities are welcome also. Übung macht den
>>  Meister.
> 
> See also: 
> 
> https://docs.python.org/dev/library/functools.html#functools.lru_cache
> 
> A bit hard to find unless you already know it's there.

If you Google for memoization decorator, you will easily find many more implementations. Not 100 percent sure, but I think the LRU cache decorator was not exactly light weight. I also like this one from Martelli's Python Cookbook, where he uses a mutable default argument {a dictionary} to implement memoization. I believe I went like this:


def some_func(arg, _memoize={}):
    try:
        return _memoize[arg]
    except KeyError:
        result = some_expensive_operation(arg)
        _memoize[arg] = result
        return result

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Wrote a memoize function: I do not mind feedback Cecil Westerhof <Cecil@decebal.nl> - 2015-04-27 15:35 +0200
  Re: Wrote a memoize function: I do not mind feedback Peter Otten <__peter__@web.de> - 2015-04-27 16:28 +0200
  Re: Wrote a memoize function: I do not mind feedback Albert-Jan Roskam <fomcl@yahoo.com> - 2015-04-27 20:35 +0000
    Re: Wrote a memoize function: I do not mind feedback Cecil Westerhof <Cecil@decebal.nl> - 2015-04-29 08:06 +0200
      Re: Wrote a memoize function: I do not mind feedback Ian Kelly <ian.g.kelly@gmail.com> - 2015-04-29 01:02 -0600
        Re: Wrote a memoize function: I do not mind feedback Cecil Westerhof <Cecil@decebal.nl> - 2015-04-29 10:04 +0200
          Re: Wrote a memoize function: I do not mind feedback Mark Lawrence <breamoreboy@yahoo.co.uk> - 2015-04-29 09:58 +0100
            Re: Wrote a memoize function: I do not mind feedback Cecil Westerhof <Cecil@decebal.nl> - 2015-04-29 13:52 +0200

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