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You may have introduces variable sum with a rational value somewhere earlier in your code. If that the case, calling sum() will raise an error like the one you observe.

You may have introduces introduced variable sum with a rational value somewhere earlier in your code. If that the case, calling sum() will raise an error like the one you observe.

You may have introduced variable sum with a rational value somewhere earlier in your code. If that is the case, calling sum() will raise an error like the one you observe.