Finding last occurrence of substring in string replacing that

Question

So I have a long list of strings in the same format  and I want to find the last     character in each one  and replace it with    -    I ve tried using rfind  but I can t seem to utilize it properly to do this

User · Answer

a    A long string with a   in the middle ending with          if you want to find the index of the last occurrence of any string  In our case we  will find the index of the last occurrence of with  index   a rfind  with        the result will be 44  as index starts from 0

User · Answer

Na  ve approach   a    A long string with a   in the middle ending with    fchar       rchar      -  a   -1  replace fchar  rchar   -1   1    -1   Out 2    A long string with a   in the middle ending with   -      Aditya Sihag s answer with a single rfind   pos   a rfind      a  pos       -    a pos 1

User · Answer

This should do it  old string    this is going to have a full stop  some written sstuff   k   old string rfind      new string   old string  k       -     old string k 1

User · Answer

A one liner would be      str str   -1  replace       -  1    -1

User · Answer

You can use the function below which replaces the first occurrence of the word from right   def replace from right text  str  original text  str  new text  str  - gt  str          Replace first occurrence of original text by new text          return text   -1  replace original text   -1   new text   -1   1    -1

User · Answer

I would use a regex   import re new list    re sub r                r   -    s  for s in old list

User · Answer

To replace from the right   def replace right source  target  replacement  replacements None       return replacement join source rsplit target  replacements     In use    gt  gt  gt  replace right  asd asd asd            -   1   asd asd asd  -

[python] Finding last occurrence of substring in string, replacing that

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