Welcome to OGeek Q&A Community for programmer and developer-Open, Learning and Share
Welcome To Ask or Share your Answers For Others

Categories

0 votes
420 views
in Technique[技术] by (71.8m points)

python - How do I get a list of indices of non zero elements in a list?

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 ?

See Question&Answers more detail:os

与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
Welcome To Ask or Share your Answers For Others

1 Reply

0 votes
by (71.8m points)
[i for i, e in enumerate(a) if e != 0]

与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
OGeek|极客中国-欢迎来到极客的世界,一个免费开放的程序员编程交流平台!开放,进步,分享!让技术改变生活,让极客改变未来! Welcome to OGeek Q&A Community for programmer and developer-Open, Learning and Share
Click Here to Ask a Question

...