On Feb 18, 2023 17:28, Rob Cliffe via Python-list <python-list@python.org>
wrote:
On 18/02/2023 15:29, Thomas Passin wrote:
> On 2/18/2023 5:38 AM, Albert-Jan Roskam wrote:
>> I sometimes use this trick, which I learnt from a book by
Martelli.
>> Instead of try/except, membership testing with "in"
>> (__contains__) might
>> be faster. Probably "depends". Matter of measuring.
>> def somefunc(arg, _cache={}):
>> if len(_cache) > 10 ** 5:
>> _cache.pop()
>> try:
>> return _cache[arg]
>> except KeyError:
>> result = expensivefunc(arg)
>> _cache[arg] = result
>> return result
>> Albert-Jan
>
> _cache.get(arg) should be a little faster and use slightly fewer
> resources than the try/except.
>
Provided that you can provide a default value to get() which will never
be a genuine "result".
=====
This might be better than None:
_cache.get(arg, Ellipsis)
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