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  1. test = 'a1.jpg, a2.jpg, a3.jpg, b1.jpg, b2.jpg, b3.jpg, b4.jpg'
  2. l = test.split(', ')
  3. res = {}
  4. for fname in l:
  5.     key = fname[0]
  6.     res.setdefault(key, []).append(fname)
  7. print(list(res.values()))
  8.  
Success #stdin #stdout 0.02s 9220KB
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stdin
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Standard input is empty
stdout
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[['a1.jpg', 'a2.jpg', 'a3.jpg'], ['b1.jpg', 'b2.jpg', 'b3.jpg', 'b4.jpg']]
https://ideone.com/X92isi
language:
Python 3 (python  3.12)
created:
4 years ago
visibility:
secret

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