How can I print the possible combinations of a list in Python?

Question

My list is:

groupA=[\'Russia\', \'Egypt\', \'Saudi Arabia\', \'Uruguay\']

So I want to print all the unique combinations of teams that will

Answer 1

This can do the trick:

groupA = ['Russia', 'Egypt', 'Saudi Arabia', 'Uruguay']
for index, country in enumerate(groupA):
    for rival in groupA[index+1:]:
        print('%s vs %s'%(country, rival) )

Answer 2

This should do what you want:

groupA=['Russia', 'Egypt', 'Saudi Arabia', 'Uruguay']

for i in range(len(groupA)):
  for j in range(i+1, len(groupA)):
    print("{} Vs. {}".format(groupA[i], groupA[j]))

If you prefer using itertools:

from itertools import combinations

groupA=['Russia', 'Egypt', 'Saudi Arabia', 'Uruguay']

for combo in combinations(groupA, 2):
  print("{} Vs. {}".format(combo[0], combo[1]))

Answer 3

Whenever you're thinking of permutations, combinations, Cartesian products, etc, think of the itertools library; it's standard to Python. And if it's not in there have a look at sympy.

>>> from itertools import combinations
>>> for c in combinations(groupA, 2):
...     '{} Vs. {}'.format(*c)
... 
'Russia Vs. Egypt'
'Russia Vs. Saudi Arabia'
'Russia Vs. Uruguay'
'Egypt Vs. Saudi Arabia'
'Egypt Vs. Uruguay'
'Saudi Arabia Vs. Uruguay'

format is a nice alternative for output too.