下面是一个使用AWS SDK for Python（Boto3）的代码示例，展示如何获取AWS账户的上下文和边界：

import boto3

# 创建IAM客户端
iam_client = boto3.client('iam')

# 获取当前用户的ARN
response = iam_client.get_user()
user_arn = response['User']['Arn']
print('User ARN:', user_arn)

# 获取当前用户所属的组
response = iam_client.list_groups_for_user(UserName='username')
groups = response['Groups']
group_arns = [group['Arn'] for group in groups]
print('Group ARNs:', group_arns)

# 获取当前用户的权限策略
response = iam_client.list_attached_user_policies(UserName='username')
attached_policies = response['AttachedPolicies']
policy_arns = [policy['PolicyArn'] for policy in attached_policies]
print('Attached Policy ARNs:', policy_arns)

# 获取当前用户所属的角色
response = iam_client.list_roles()
roles = response['Roles']
role_arns = [role['Arn'] for role in roles if user_arn in role['AssumeRolePolicyDocument']]
print('Role ARNs:', role_arns)

# 获取当前用户的访问密钥
response = iam_client.list_access_keys(UserName='username')
access_keys = response['AccessKeyMetadata']
access_key_ids = [key['AccessKeyId'] for key in access_keys]
print('Access Key IDs:', access_key_ids)

请注意将代码中的username替换为实际的IAM用户名。

这个示例代码使用AWS SDK for Python（Boto3）中的boto3.client('iam')创建了一个IAM客户端对象。然后，它调用不同的方法来获取AWS账户的上下文和边界信息。例如，get_user方法获取当前用户的ARN，list_groups_for_user方法获取当前用户所属的组，list_attached_user_policies方法获取当前用户的权限策略，list_roles方法获取当前用户所属的角色，list_access_keys方法获取当前用户的访问密钥。

您可以根据自己的需求使用这些方法来获取AWS账户的上下文和边界信息。