[Tutor] Adding numbers within a string

[hell gates]

   You can write your own str.split or just use while loop.
   12.10.2016, 15:12, "LQ Soh" <sohlq710 at gmail.com>:

     To whom it may concern,
     Can someone enlighten me as to how you can create a function such
     that sum_numbers('10 5 8'), when run, will give an answer of 23, without
     using str.split() and using a for loop
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