Iterate over agents in turn order

-----|-----|----------| | Turn-based games (card, board games) | ✅ Best fit | ❌ Not appropriate | | Simultaneous action (robotics, MPE) | ⚠️ Works but awkward | ✅ Best fit | | Compatible with CleanRL | ✅ Via wrappers | ❌ Needs conversion | | Compatible with SB3 | ❌ Not directly | ❌ Needs conversion |

3. Key AEC Methods

# Iterate over agents in turn order
for agent in env.agent_iter():
    # Get the observation/reward for the CURRENT agent
    observation, reward, termination, truncation, info = env.last()

    # Check if the agent is done
    if termination or truncation:
        action = None
    else:
        action = policy(observation, agent)

    # Submit action — this steps the environment AND advances to next agent
    env.step(action)

# After loop: check which agents are still active
print(env.agents)  # List of active agents

4. Available Environments

List all available:

from pettingzoo.utils import all_modules