Calculates the request payload size

def calculate_size(name, data_list):
    """ Calculates the request payload size"""
    data_size = 0
    data_size += calculate_size_str(name)
    data_size += INT_SIZE_IN_BYTES
    for data_list_item in data_list:
        data_size += calculate_size_data(data_list_item)
    return data_size