pythonType errorMedium

Adding up "4,5,6" crashes

Time: 0:00

BugFind the bug and fix the code

What it should do

csv_total(line) adds up numbers separated by commas. Example: csv_total("4,5,6") → 15.

What happens instead

csv_total("4,5,6") crashes: TypeError: unsupported operand type(s) for +: 'int' and 'str'.

Hints

This is a type errors bug

Totals that concatenate, sorts that put 10 before 9, comparisons that refuse to run.

Learn the type errors pattern Step through your own code

Spoiler: why this bug happens(try it first; the hints get warmer one at a time)

What went wrong: split() returns text, like "4". sum() cannot add text to numbers.

The fix: return sum(int(v) for v in values)

Remember: split() always gives text. Convert the pieces before doing maths.

The pattern behind it: type errors.

More type errors to practise

Seen this error in your own code?

TypeError: unsupported operand type(s) for +: 'int' and 'str'

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