Your question is Interpreting Code Behavior. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
Five9 routes inbound calls into per-team queues before an agent picks them up. A QA engineer flagged that two different teams' call queues seem to be bleeding into each other in a staging trace. Here is the routing helper in question.
def enqueue_call(call_id, queue=[]):
queue.append(call_id)
return queue
def route_calls():
team_a_view = enqueue_call("call-101")
team_b_view = enqueue_call("call-202")
return team_a_view, team_b_view
enqueue_call is called without its queue argument every time in this code path, once per inbound call, exactly as shown in route_calls. What would this code actually do? Trace through the exact sequence of calls in route_calls and state exactly what team_a_view and team_b_view each hold by the time the function returns, and explain why.