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  1. from itertools import accumulate, groupby
  2. from operator import itemgetter
  3.  
  4. x = ['!test','hello','world','!echo','!embed','oh god']
  5.  
  6. cumsum = accumulate(map(lambda s: s.startswith('!'), x))
  7. result = ['\n'.join(map(itemgetter(0), g)) for _, g in groupby(zip(x, cumsum), itemgetter(1))]
  8.  
  9. print(result)
Success #stdin #stdout 0.03s 9360KB
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stdin
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Standard input is empty
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['!test\nhello\nworld', '!echo', '!embed\noh god']
https://ideone.com/TndjMB
language:
Python 3 (python  3.9.5)
created:
6 years ago
visibility:
public

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