double_swap("aabbccc", "a", "b") ➞ "bbaaccc"

double_swap("random w#rds writt&n h&r&", "#", "&") ➞ "random w&rds writt#n h#r#"

double_swap("128 895 556 788 999", "8", "9") ➞ "129 985 556 799 888"

self.assertEqual(double_swap("aabbccc", "a", "b"), "bbaaccc")
self.assertEqual(double_swap("random w#rds writt&n h&r&", "#", "&"), "random w&rds writt#n h#r#")
self.assertEqual(double_swap("128 895 556 788 999", "8", "9"), "129 985 556 799 888")
self.assertEqual(double_swap("<>", ">", "<"), "><")
self.assertEqual(double_swap("001101", "1", "0"), "110010")
self.assertEqual(double_swap("(Q_Q) (T_T) (=.=) (>.<)", ")", "("), ")Q_Q( )T_T( )=.=( )>.<("))

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