11 Handshaking combinations

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import itertools
import numpy as np
import pandas as pd
from pandas import Series, DataFrame
import matplotlib.pyplot as plt
import seaborn as sns
from scipy import stats, special

khanacademy

persons = ['A', 'B', 'C', 'D']
shakes = [1, 2]

p = list(itertools.permutations(persons, len(shakes)))
c = list(itertools.combinations(persons, len(shakes)))

p

[('A', 'B'),
 ('A', 'C'),
 ('A', 'D'),
 ('B', 'A'),
 ('B', 'C'),
 ('B', 'D'),
 ('C', 'A'),
 ('C', 'B'),
 ('C', 'D'),
 ('D', 'A'),
 ('D', 'B'),
 ('D', 'C')]

c

[('A', 'B'), ('A', 'C'), ('A', 'D'), ('B', 'C'), ('B', 'D'), ('C', 'D')]

len(p)

12

len(c)

6

special.perm(len(persons), len(shakes))

12.0

special.comb(len(persons), len(shakes))

6.0