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seckcoder/gist:5575284

Last active December 17, 2015 07:48
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从一个字符串中找到从右往左数第3个下划线的index
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gistfile1.txt
import itertools
a = "abc_d_e_f"
print list(itertools.islice((i for i,c in enumerate(reversed(a)) if c == '_'), 3))[2]
def take(n, iterable):
return list(itertools.islice(iterable, n))
print take(3, (i for i,c in enumerate(reversed(a)) if c == '_'))[2]
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