Python

Working with Collections

# Initialize a deque for waiting calls
# Add callers to the queue
# Pop them in the order they were added

timeline = [("add_caller", "Bob"), ("answer_caller", None), ("add_caller", "Tim"), ("add_caller", "Tony"), ("answer_caller", None), ("add_caller", "Steve")]

# Initialize deque here
# waiting_calls =

for activity, caller in timeline:
  if activity == "add_caller":
    print(f"Adding caller {caller} to waiting list")
    # Add caller to waiting calls
  elif activity == "answer_caller":
    # Pop caller from waiting calls in the order they were added
    # caller =
    print(f"Answering call of {caller}")

print(f"There are {len(waiting_calls)} calls in the waiting list.")


from collections import deque

timeline = [("add_caller", "Bob"), ("answer_caller", None), ("add_caller", "Tim"), ("add_caller", "Tony"), ("answer_caller", None), ("add_caller", "Steve")]

waiting_calls = deque()

for activity, caller in timeline:
  if activity == "add_caller":
    print(f"Adding caller {caller} to waiting list")
    waiting_calls.append(caller)
  elif activity == "answer_caller":
    caller = waiting_calls.popleft()
    print(f"Answering call of {caller}")

print(f"There are {len(waiting_calls)} calls in the waiting list.")
