Signatures:

itertools.combinations(iterable, r)
Return r length subsequences of elements from input iterable.

itertools.permutations(iterable, r=None)
Return successive r length permutations of elements in iterable

If r is not specified or is None, then r defaults to length of iterable.

Examples:

import itertools

friends = ['Monique', 'Ashish', 'Devon', 'Bernie']

# Order of elements doesn't matter
list(itertools.combinations(friends, r=2))

# [
#   ('Monique', 'Ashish'), ('Monique', 'Devon'), ('Monique', 'Bernie'),
#   ('Ashish', 'Devon'), ('Ashish', 'Bernie'), ('Devon', 'Bernie')
# ]

# Order matters
list(itertools.permutations(friends, r=2))

# [
#   ('Monique', 'Ashish'), ('Monique', 'Devon'), ('Monique', 'Bernie'),
#   ('Ashish', 'Monique'), ('Ashish', 'Devon'), ('Ashish', 'Bernie'),
#   ('Devon', 'Monique'), ('Devon', 'Ashish'), ('Devon', 'Bernie'),
#   ('Bernie', 'Monique'), ('Bernie', 'Ashish'), ('Bernie', 'Devon')
# ]

References:

1. https://realpython.com/python-coding-interview-tips/#generate-permutations-and-combinations-with-itertools
2. https://docs.python.org/3/library/itertools.html#itertools.permutations
3. https://docs.python.org/3/library/itertools.html#itertools.combinations