def get_default_sort_key(customer):
return (<EOL>not bool(customer.given_name or customer.family_name),<EOL>((customer.given_name or '<STR_LIT>') + (customer.family_name or '<STR_LIT>')).strip(),<EOL>bool(customer.company_name),<EOL>(customer.company_name or '<STR_LIT>'))<EOL>
Create the default sort key for a customer.

    Args:
        customer: the customer to create the default sort key.

    Return:
        the sort key.