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  1. # your code goes here
  2. import re
  3. pattern = r"(?<!\S)-?\d+(?:\.\d+)?(?!\S)"
  4. s = "102.3  42.89  98  812.7  374  5  -123  8  -123  13  -123  21"
  5.  
  6. print(re.sub(pattern, lambda m: "456" if m.group() != "-123" else m.group(), s))
  7.  
Success #stdin #stdout 0.02s 27744KB
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stdin
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Standard input is empty
stdout
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456  456  456  456  456  456  -123  456  -123  456  -123  456
https://ideone.com/5JQSTf
language:
Python 3 (python  3.9.5)
created:
5 years ago
visibility:
public

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