CODEWITHSUNDEEP
pythonloops
J. Tate
J. Tate

Reputation: 163

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

My list is:

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

So I want to print all the unique combinations of teams that will play each other:

Russia Vs. Egypt
Russia Vs. Saudi Arabia
Russia Vs. Uruguay
Egypt Vs. Saudi Arabia
Egypt Vs. Uruguay
Saudi Arabia Vs. Uruguay

Can I do this with a for loop?

Upvotes: 0

Views: 138

Answers (3)

Bill Bell
Bill Bell

Reputation: 21643

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.

Upvotes: 2

thumbtackthief
thumbtackthief

Reputation: 6211

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]))

Upvotes: 2

Shailyn Ortiz
Shailyn Ortiz

Reputation: 766

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) )

Upvotes: 2

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