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Update mentoring.md #2349

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2 changes: 1 addition & 1 deletion tracks/python/exercises/armstrong-numbers/mentoring.md
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Expand Up @@ -37,7 +37,7 @@ def is_armstrong_number(number):
# With a generator expression passed to sum
total = sum(digit ** count for digit in digits)
```
Students are often unaware of [generator expressions][pep-289] and that they can be passed directly to functions that accept iterables.
Students are often unaware of [generator expressions][pep-289] and that they can be passed directly to functions that accept iterable.
The first line uses a comprehension to build a `list` for `sum()` to iterate through.
The middle step of a temporary list takes up space in memory and is not needed.
The second line shows the `list` replaced by an equivalent `generator expression` that `sum()` can also iterate through.
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