BartC bc at freeuk.com
Tue Sep 20 08:16:56 EDT 2016

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On 20/09/2016 13:12, 380162267qq at gmail.com wrote:
>>>> d = {}
>>>> keys = range(256)
>>>> vals = map(chr, keys)
>>>> map(operator.setitem, [d]*len(keys), keys, vals)
>
> It is from python library. What does [d]*len(keys) mean?
> d is the name of dict but put d in [] really confused me.
>

if len(keys) is 5 then [d]*5 is:

    [d,d,d,d,d]

[d] is a list, containing one item, a dict if that is what it is.

-- 
Bartc

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