Cooccurrence Question

cooccurrence.py

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import itertools
from collections import defaultdict

class Cooccurrence:
    def __init__(self):
        self.__counts = defaultdict(int)
    
    def append(self, line):
        s = line.split()
        s.sort()
        for i in itertools.combinations(s, 2):
            print(i, line)
            self.__counts[i] += 1
                
    def get(self, a, b):
        params = [a, b]
        params.sort()
        return self.__counts[(params[0], params[1])]

        
# alice bob
# bob claire dan alice

c = Cooccurrence()
c.append('alice bob')
c.append('bob claire dan alice')
c.append('ben claire dele alice')
c.append('ben john dele amaka')
c.append('ben dele alice bob')

c.get('alice', 'bob')