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chore(curriculum): acknowledge exceptions in Luhn algorithm (#54753)

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curriculum/challenges/english/07-scientific-computing-with-python/learn-how-to-work-with-numbers-and-strings-by-implementing-the-luhn-algorithm/65687b182c2a8fb1470e0b97.md
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@ -9,6 +9,8 @@ dashedName: step-20
Within the `for` loop, use the `+=` operator to add the `digit` to the `sum_of_odd_digits` variable.
Doing this your script throws a `TypeError` because you are trying to add a string to an integer, but don't worry, you will learn more about how to make it work in the next step.
# --hints--
You should have `sum_of_odd_digits += digit` within the `for` loop.