[Solved] Connecting strings in a element without using double for loops Python [duplicate]

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Use itertools:

import itertools

#to include pairs with same element (i.e. 1-1, 2-2 and 3-3)
>>> ["-".join(pair) for pair in itertools.product(lst, lst)]
['1-1', '1-2', '1-3', '2-1', '2-2', '2-3', '3-1', '3-2', '3-3']

#to exclude pairs with the same element
>>> ["-".join(pair) for pair in itertools.permutations(lst, 2)]
['1-2', '1-3', '2-1', '2-3', '3-1', '3-2']

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solved Connecting strings in a element without using double for loops Python [duplicate]