使用AWS Chime SDK退出会议可以通过以下步骤完成：

1. 导入必要的库和模块：

import boto3
from botocore.exceptions import NoCredentialsError

2. 创建AWS Chime客户端：

chime_client = boto3.client('chime')

3. 使用会议ID和成员ID加入会议：

def join_meeting(meeting_id, member_id):
    try:
        response = chime_client.create_attendee(
            MeetingId=meeting_id,
            ExternalUserId=member_id
        )
        attendee = response['Attendee']
        join_info = {
            'MeetingId': meeting_id,
            'Attendee': {
                'ExternalUserId': attendee['ExternalUserId'],
                'AttendeeId': attendee['AttendeeId'],
                'JoinToken': attendee['JoinToken']
            }
        }
        return join_info
    except NoCredentialsError:
        return "无法找到有效的AWS凭证"

4. 退出会议：

def leave_meeting(meeting_id, attendee_id):
    try:
        response = chime_client.delete_attendee(
            MeetingId=meeting_id,
            AttendeeId=attendee_id
        )
        return response
    except NoCredentialsError:
        return "无法找到有效的AWS凭证"

完整的代码示例：

import boto3
from botocore.exceptions import NoCredentialsError

chime_client = boto3.client('chime')

def join_meeting(meeting_id, member_id):
    try:
        response = chime_client.create_attendee(
            MeetingId=meeting_id,
            ExternalUserId=member_id
        )
        attendee = response['Attendee']
        join_info = {
            'MeetingId': meeting_id,
            'Attendee': {
                'ExternalUserId': attendee['ExternalUserId'],
                'AttendeeId': attendee['AttendeeId'],
                'JoinToken': attendee['JoinToken']
            }
        }
        return join_info
    except NoCredentialsError:
        return "无法找到有效的AWS凭证"

def leave_meeting(meeting_id, attendee_id):
    try:
        response = chime_client.delete_attendee(
            MeetingId=meeting_id,
            AttendeeId=attendee_id
        )
        return response
    except NoCredentialsError:
        return "无法找到有效的AWS凭证"

# 使用示例
meeting_id = 'your_meeting_id'
member_id = 'your_member_id'

join_info = join_meeting(meeting_id, member_id)
print(join_info)

attendee_id = join_info['Attendee']['AttendeeId']
response = leave_meeting(meeting_id, attendee_id)
print(response)

以上代码提供了通过AWS Chime SDK加入和退出会议的示例。请将"your_meeting_id"和"your_member_id"替换为实际的会议和成员ID。