Question: Use Python to write a method digit_sum() that will add the digits of a given input and if the sum is a single digit, it

Use Python to write a method digit_sum() that will add the digits of a given input and if the sum is a single digit, it will return that output and if not, it will add the digits of the following sum until a single digit sum is reached. The method signature should be digit_sum(num) and return an integer.

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