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  1. import re
  2. string = '1. 0.1, 0.2, тест, тест. 2. тест, тест, 0.5=0.3+0.2.'
  3. new = re.sub(r'(?<=\d)\.(?=\d)', ',', string)
  4. print(new)
  5.  
Success #stdin #stdout 0.03s 9480KB
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Standard input is empty
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1. 0,1, 0,2, тест, тест. 2. тест, тест, 0,5=0,3+0,2.
https://ideone.com/wKVA9E
language:
Python 3 (python  3.9.5)
created:
2 years ago
visibility:
secret

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