How to get combinations of list of names sorted in an alphabetical order?

August 3, 2022

I have a list of names as:

names_list = ['Acosta Jose','Bailey Tyler','Barbosa Roberto','Calabro James','Carasone Allison','Adams Zane','Brencher Tim','Chacon Ramon','Arce Manuel']

I would like to get a combinations of names per each alphabet letter.

For example: A letter names are: ‘Acosta Jose’,’Adams Zane’,’Arce Manuel’

Here required combinations are:

Acosta Jose Adams Zane
Acosta Jose Arce Manuel
Adams Zane Arce Manuel

Final Required output for given name list is:

[['Acosta Jose, Adams Zane',
  'Acosta Jose,Arce Manuel',
  'Adams Zane, Arce Manuel'],
 ['Bailey Tyler, Barbosa RobertoBailey Tyler, Brencher TimBarbosa Roberto, '
  'Brencher Tim'],
 ['Calabro James, Carasone AllisonCalabro James, Chacon RamonCarasone Allison '
  ',Chacon Ramon']]

>Solution :

The output shown in the question is rather confusing. However, the description seems to indicate that this is what’s required:

from itertools import combinations

names_list = ['Acosta Jose','Bailey Tyler','Barbosa Roberto','Calabro James','Carasone Allison','Adams Zane','Brencher Tim','Chacon Ramon','Arce Manuel']

ds = {}

for name in sorted(names_list):
    ds.setdefault(name[0], []).append(name)

output = ([[f'{a}, {b}' for a, b in combinations(e, 2)] for e in ds.values()])

print(output)

Output:

[['Acosta Jose, Adams Zane', 'Acosta Jose, Arce Manuel', 'Adams Zane, Arce Manuel'], ['Bailey Tyler, Barbosa Roberto', 'Bailey Tyler, Brencher Tim', 'Barbosa Roberto, Brencher Tim'], ['Calabro James, Carasone Allison', 'Calabro James, Chacon Ramon', 'Carasone Allison, Chacon Ramon']]