A way for picking specific indices from an object where slicing isn't helpful

Question

I'm looking for a way to access an object multiple times in an easy way.

Ex. 1)

ls = [i for i in range(100)]; print(ls[0], ls[32], ls[95])

Ex. 2)

js = {'key0': 'val0', ...}; print (js['keyN'], js['keyM'])

What I'm looking for is a way to only specify the object once, and then specify the wanted indices (something like slice). Meaning ls[0,32,95], or js['keyN][inner_keyN_M, innerkeyN_M+3]

locke14 · Accepted Answer · 2019-07-08T08:06:58.040

2

You can use the itemgettermodule.

from operator import itemgetter
ls = [i for i in range(100)]
ids = [0, 32, 95]
print(itemgetter(*ids)(ls))

Output

(0, 32, 95)

You can also use list comprehension:

ls = [i for i in range(100)]
ids = [0, 32, 95]

print([ls[id] for id in ids])

edited Jul 08 '19 at 08:06

answered Jul 08 '19 at 07:57

locke14

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I actually do something like this usually: `a,b,c = (obj[bla][key] for key in ('x','y','z'))` – CIsForCookies Jul 08 '19 at 08:17

A way for picking specific indices from an object where slicing isn't helpful

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