Exercise: sort pairs

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Create a function called sort_pairs, that would receive a sorting method, e.g. the word 'keys' or the word 'values' and will receive an arbitrary number of key-value pairs and will return a list of tuples.

sort_pairs( 'keys', foo = 23, bar = 47)
[('bar', 47), ('foo', 23)]

sort_pairs( 'values', foo = 23, bar = 47)
[('foo', 23), ('bar', 47)]