hard20 pts · first answer countshash-mappythondebugging

Deleting from a dict while looping

This Python loop raises an error. What is it, and what is the fix?

for user, last_seen in sessions.items():
    if last_seen < cutoff:
        del sessions[user]

A.KeyError; use sessions.pop(user, None)B.No error, but some keys are skippedC.TypeError; dict items cannot be deletedD.RuntimeError; loop over a list() copy

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Deleting from a dict while looping

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