def delete_db_security_group(DBSecurityGroupName=None):
    """
    Deletes a DB security group.
    See also: AWS API Documentation
    
    Examples
    The following example deletes a DB security group.
    Expected Output:
    
    :example: response = client.delete_db_security_group(
        DBSecurityGroupName='string'
    )
    
    
    :type DBSecurityGroupName: string
    :param DBSecurityGroupName: [REQUIRED]
            The name of the DB security group to delete.
            Note
            You cannot delete the default DB security group.
            Constraints:
            Must be 1 to 255 alphanumeric characters
            First character must be a letter
            Cannot end with a hyphen or contain two consecutive hyphens
            Must not be 'Default'
            

    :return: response = client.delete_db_security_group(
        DBSecurityGroupName='mysecgroup',
    )
    
    print(response)
    
    
    """
    pass
