189 – Create pairs

189 – Create pairs#

To create pairs with elements from an iterable, you can use itertools.product for all ordered pairs:

from itertools import product

names = ["Harry", "Hermione", "Ron"]

for a, b in product(names, repeat=2):
    print(a, b)

Harry Harry
Harry Hermione
Harry Ron
Hermione Harry
Hermione Hermione
Hermione Ron
Ron Harry
Ron Hermione
Ron Ron

The pairs created included repeated elements, which you might want to filter by hand. Alternatively, you can use itertools.combinations for all unique pairs:

from itertools import combinations

for a, b in combinations(names, 2):
    print(a, b)

Harry Hermione
Harry Ron
Hermione Ron