Question: Define a function called digit_sum() which takes a string and returns the sum of all the digits in the string, ignoring any characters which aren't

Define a function called digit_sum() which takes a string and returns the sum of all the digits in the string, ignoring any characters which aren't digits. So digit_sum("257") should return 14 and digit_sum("Any1 4 10nis?") should return 6.

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