def describe_limits():
    """
    Returns the current provisioned-capacity limits for your AWS account in a region, both for the region as a whole and for any one DynamoDB table that you create there.
    When you establish an AWS account, the account has initial limits on the maximum read capacity units and write capacity units that you can provision across all of your DynamoDB tables in a given region. Also, there are per-table limits that apply when you create a table there. For more information, see Limits page in the Amazon DynamoDB Developer Guide .
    Although you can increase these limits by filing a case at AWS Support Center , obtaining the increase is not instantaneous. The DescribeLimits action lets you write code to compare the capacity you are currently using to those limits imposed by your account so that you have enough time to apply for an increase before you hit a limit.
    For example, you could use one of the AWS SDKs to do the following:
    This will let you see whether you are getting close to your account-level limits.
    The per-table limits apply only when you are creating a new table. They restrict the sum of the provisioned capacity of the new table itself and all its global secondary indexes.
    For existing tables and their GSIs, DynamoDB will not let you increase provisioned capacity extremely rapidly, but the only upper limit that applies is that the aggregate provisioned capacity over all your tables and GSIs cannot exceed either of the per-account limits.
    The DescribeLimits Request element has no content.
    See also: AWS API Documentation
    
    Examples
    The following example returns the maximum read and write capacity units per table, and for the AWS account, in the current AWS region.
    Expected Output:
    
    :example: response = client.describe_limits()
    
    
    :rtype: dict
    :return: {
        'AccountMaxReadCapacityUnits': 123,
        'AccountMaxWriteCapacityUnits': 123,
        'TableMaxReadCapacityUnits': 123,
        'TableMaxWriteCapacityUnits': 123
    }
    
    
    """
    pass
