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Home/ Questions/Q 3332606
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Editorial Team
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Editorial Team
Asked: May 17, 20262026-05-17T23:42:21+00:00 2026-05-17T23:42:21+00:00

I have a list that will always contain only ones and zeroes. I need

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I have a list that will always contain only ones and zeroes.
I need to get a list of the non-zero indices of the list:

a = [0, 1, 0, 1, 0, 0, 0, 0]
b = []
for i in range(len(a)):
    if a[i] == 1:  b.append(i)
print b

What would be the ‘pythonic’ way of achieving this ?

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  1. Editorial Team
    Editorial Team
    2026-05-17T23:42:22+00:00Added an answer on May 17, 2026 at 11:42 pm
    [i for i, e in enumerate(a) if e != 0]
    
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