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  1. def unique_in_order(inp):
  2.     if len(inp) == 0:
  3.         return []
  4.  
  5.     res = [inp[0]]
  6.     for item in inp:
  7.         if item != res[-1]:
  8.             res.append(item)
  9.  
  10.     return res
  11.  
  12.  
  13. samples = [
  14.     "",
  15.     "a",
  16.     "aa",
  17.     "aaa",
  18.     "ab",
  19.     "aba",
  20.     "aab",
  21.     "aabb",
  22.     "aabba",
  23. ]
  24.  
  25. for sample in samples:
  26.     print(sample, unique_in_order(sample))
  27.  
  28.  
  29.  
Success #stdin #stdout 0.03s 9180KB
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stdin
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Standard input is empty
stdout
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 []
a ['a']
aa ['a']
aaa ['a']
ab ['a', 'b']
aba ['a', 'b', 'a']
aab ['a', 'b']
aabb ['a', 'b']
aabba ['a', 'b', 'a']
https://ideone.com/ukFiLa
language:
Python 3 nbc (python 3.7.3)
created:
2 years ago
visibility:
secret

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