Algorithm in Python

Each of the following snippets of pseudocode fails to live up to all of the clarity, correctness, and termination requirements of algorithms.

In each case, describe the problem, and then rewrite the pseudocode as a proper algorithm. Thank you!

(a) def contains_zero(S): for x in S return True else: return False (b) def keep-positives (S): if len (S)0 return 0 else: result- for x in S result.add (x) return result