Python: Extending a predefined named tuple

Question

I have the following named tuple:

from collections import namedtuple
ReadElement = namedtuple(\'ReadElement\', \'address value\')

and then

Answer 1

It's quite easy to knock something together that allows you to compose namedtuples from other namedtuples as well as introduce new fields.

def extended_namedtuple(name, source_fields):
    assert isinstance(source_fields, list)
    new_type_fields = []
    for f in source_fields:
        try:
            new_type_fields.extend(f._fields)
        except:
            new_type_fields.append(f) 
    return namedtuple(name, new_type_fields) 

# source types
Name = namedtuple('Name', ['first_name', 'last_name'])
Address = namedtuple('Address', ['address_line1', 'city'])
# new type uses source types and adds additional ID field
Customer = extended_namedtuple('Customer', ['ID', Name, Address])
# using the new type
cust1 = Customer(1, 'Banana', 'Man', '29 Acacia Road', 'Nuttytown')
print(cust1)

This outputs the following :

Customer(ID=1, first_name='Banana', last_name='Man', address_line1='29 Acacia Road', city='Nuttytown')