Temporary variables in list comprehensions
jussi.piitulainen at helsinki.fi
Sat Apr 8 01:51:52 EDT 2017
Roel Schroeven writes:
> Lele Gaifax schreef op 6/04/2017 20:07:
>> Piet van Oostrum <piet-l at pietvanoostrum.com> writes:
>>> It is a poor man's 'let'. It would be nice if python had a real 'let'
>>> construction. Or for example:
>>> [(tmp, tmp + 1) for x in data with tmp = expensive_calculation(x)]
>> It would be nice indeed!
>> Or even
>> [(tmp, tmp + 1) for x in data
>> with expensive_calculation(x) as tmp
>> if tmp is not None]
> Perhaps this:
> [(tmp, tmp + 1) for tmp in
> (expensive_calculation(x) for x in data)
> if tmp is not None]
> A bit less elegant, but works right now.
The "poor man's let" works right now.
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